Overall Score
98
60
98
Dolphin Sigma

Dolphin Sigma Robotic Pool Cleaner

Best Price
$1897
The Dolphin Sigma Robotic Pool Cleaner has the following:
  • Hassle-free clean. Easy-to-use, robotic pool cleaner equipped with an anti-tangling swivel cable, allowing Sigma to move freely around large residential pools up to 50 feet with ease. Backed by a 3 year quality assurance.
  • No messy bags to clean. Massive top-loading cartridge filters captures and traps fine and ultra-fine debris for an optimal clean swimming pool.
  • Powerful, dual scrubbing brushes thoroughly and efficiently attacks tough contaminants removing algae and bacteria from floor, walls and waterline for a deep clean in 2.5 hours.
  • Just say when. Set Sigma’s weekly scheduler to automatically clean for you- daily, 2x per week, or 3x per week. Connect your Sigma to your smartphone using Bluetooth to spot clean when needed.
  • Smart Navigation. Advanced navigation and scanning software ensures your pool is cleaned using the most efficient route without letting obstacles get in the way.
  • Dolphin Sigma Power Supply
  • Dolphin Sigma Waterline Cleaning
  • Dolphin Sigma High Capacity Filters
  • Dolphin Sigma 3 Year Warranty
  • Dolphin Sigma Gyroscope
  • Dolphin Sigma SmartNavigation
  • Dolphin Sigma Dual Filters
  • Dolphin Sigma Quad Scrubbing Brushes
  • Dolphin Sigma Triple Commercial Grade Motors
  • Cleaning Sigma's Filters
  • Dolphin Sigma In Swimming Pool
Scorecard

Ratings

Waterline Cleaning Excellent High
Filter Excellent High
Coverage Excellent High
User Experience Excellent High
Warranty Excellent High
Overall Score
98
Check mark Highs

Most Advanced Dolphin Ever - Lots of technology packed in one unit.

Gyroscope Technology

Multiple Filter Options

Quad Scrubbing Brushes - 4X Cleaning Power

3 Commercial Grade, Efficient Motors

X icon Lows

Pricey, but Fantastic Value

No Filter Bag


Dolphin Sigma Review

As the robotic pool cleaner industry grows by leaps and bounds, Maytronics has remained a frontrunner in developing new products and new technology. One of their latest models of robotic pool cleaners is the Sigma from their Dolphin line. The Sigma is the top of Dolphin’s deluxe class of robotic pool cleaners. The description goes so far as to say it has “reinterpreted” the laws of physics. We decided to put the Dolphin Sigma to the test and see how it lived up to these expectations – and we weren’t disappointed.

First Impressions

At first glance, the Sigma just looks more compact, more powerful, and sleeker than many of its counterparts. It’s heavy, weighing 24.6 pounds, but its power in the water isn’t hindered at all by its weight. The handle makes for easy lifting and carrying, but you can also order a caddy for even more streamlined transporting and storage.

The set-up was seamless, and the Sigma arrived pretty much ready to get to work after unboxing it. Once it was plugged in and had reached the bottom of the pool, it was time to see it go to work.

The Sigma in Action

To be quite honest, many robotic pool cleaners on the market today are lackluster. Like a glorified feather duster for the pool, they’ll often wander aimlessly and do a superficial-at-best cleaning job, leaving the same pile of leaves untouched for days. Not the Sigma.

Once we saw the Dolphin Sigma in action, we found three things that particularly set this robotic pool cleaner apart from all others: Gyroscope technology, DC motors, and SmartNav Robotic Scanning.

The Game-Changing Gyroscope

Dolphin’s engineers added a three-axis gyroscope to the Sigma, which includes high-tech sensors that detect and measure the rate of rotation of an object around a particular axis. To put it in laymen’s terms, these sensors keep tabs on what the robot is doing and send information to the microprocessor so it can essentially think for itself.

Like a Mars Rover for the pool, the gyroscopic technology monitors and controls position, orientation, direction, and rotation. That sounds like a lot of technical jargon until you actually get to watch it in reality – then it’s really awesome.

The Sigma covered every surface of the pool without retracing its steps monotonously or randomly overlooking certain sections. And when we say every surface of the pool, we mean every surface. The gyroscopic stabilization keeps the Sigma from floating away from surfaces, even when it is climbing walls or navigating underwater steps or curves. It delivers a precise control unlike anything we’ve seen in competitors’ robotic pool cleaners, even cleaning the tile and waterline with pinpoint accuracy. For such a large machine, it navigates the pool gracefully and precisely. Every pool has those hard-to-reach corners or deep curves that are easy to overlook by both humans and machines, but the Sigma covers them easily.

Commercial-Grade Efficiency and Power

Most old-fashioned pool cleaners use AC motors that notoriously guzzle power and raise your electric bill even higher than usual in the hot months. The Sigma, however, uses a whopping three DC motors. This choice allows the robot to provide up to five times the torque without stalling, and it requires nearly 90% less energy than traditional pool cleaners. Dolphin approximates it costing 5 cents an hour to operate. That’s an energy-efficient number we can get behind.

The power of the Sigma is obvious when you watch it work. It has a much higher flow rate, seamlessly cleaning a 50-foot pool in just 2.5 hours. It moves with a steady quickness thanks to the balancing act of the gyroscope mixed with the power of the three DC motors.

Navigation Expert

The gyroscopic control system shines again in the SmartNav 3.0 navigation. Like we mentioned before, even the best engineered robotic pool cleaners will still wander around aimlessly without a smart control system to map out a path for it. During a cleaning, the Sigma knows what surface area it has covered already, avoiding the redundancy of cleaning the same space twice. More than that, it actually calculates the optimal pattern of your pool for a faster and more efficient cleaning time.

When we put it to the test, the Sigma didn’t linger mindlessly in one area of the pool, nor did it miss any of the dispersed debris we had placed around the bottom. Most impressive of all, though, was how it avoided getting its cord tangled like so many previous cleaners.

But Did It Actually Clean?

Technology mumbo jumbo aside, let’s get down to brass tacks. The Dolphin Sigma cleaned with exceptional results.

The pool we used for our testing was well overdue for a cleaning. We had let leaves, flower buds, pollen, bugs, and dog toys accumulate for several days, not to mention the regular algae buildup. There was a distinct presence of sludge along the waterline of the tile, too. Then we let the Sigma loose.

After it did its first 2.5 hour cleaning cycle, the pool was virtually spotless. Of course it bypassed the tennis balls left behind by the dog, but it sucked up all of the leaves and other bits of flora with ease. The real sign of accomplishment was the disappearance of the sludge along the waterline. Honestly, we expected it to leave behind at least a bit of debris since the pool had gone so long between cleanings, but we were disappointed to not be disappointed. The Sigma cleans with incredible precision.

The Proof is in the Filters

We saw the larger debris disappear, but how well did the Sigma actually clean the water? And how well did it scrub the sides of the pool?

Well, we found our answer in the filters.

The Sigma is fitted with two top-loading cartridge filters. Unlike the same devices from years past, these are larger and infinitely easier to clean. When we went to clean them out after the Sigma’s first test clean, they were impressively full of large debris, and the filter was satisfyingly dark with fine dirt and algae. With a filtration rate of 75 gallons per minute, it’s no wonder. The Sigma leaves behind remarkable water quality.

If you look closely at the Sigma, you’ll see another reason it grabs so much during its cleaning runs – the brushes. Dolphin has patented its PowerClean dual scrubbing brushes, which actively scrub the pool’s surface instead of just passing over it for larger particles. With two different textures of power scrubs, the PowerClean feature actually scrubs every square inch of the pool. Plus, it’s supposed to be especially effective against biofilm, which is one of the biggest frustrations a pool owner can face. And unlike most robotic pool cleaners, the sigma is bi-directional, so it vacuums while going forward as well as reverse.

On top of its efficiency, we found the regular maintenance of the Sigma to be pretty straightforward, too. No one likes cleaning pool filters, but this one is relatively painless. Just have a hose handy and spray all the pieces down, then snap it back together with Dolphin’s nifty SnapLoc feature.

Will It Give Me a Headache?

If you’ve owned a pool for any time at all, you know the frustration that can come with owning a robotic pool cleaner. They get tangled up. They shut down mid-job. They don’t pick up the most obvious mess. They spray water in your face. They’re a nuisance to clean.

But as veteran pool owners, we can confidently say the Dolphin Sigma appears to circumvent all of these headaches.

One of our favorite features that makes an owner’s life easier is the MyDolphin Plus app. You can register any Dolphin robot pool cleaner online and control it remotely from your phone. From there you can schedule cleaning programs, set a weekly timer, and even manually control the Sigma’s cleaning job. As far as apps go, it’s not the smoothest ride in the world and may be a little frustrating for users who aren’t so tech-savvy. Sometimes the Bluetooth disconnects or has trouble connecting to the robot, but it’s a great resource.

The other standout perk of the Sigma is the ease of maintenance and upkeep. As any pool owner knows, you can’t take shortcuts to maintaining your pool without very real (and oftentimes expensive) consequences. Fortunately, there is no song and dance required with the Sigma. After each clean you need to rinse the filter while it is still wet, and you remove debris from the impeller when you notice it’s there. You can easily service your Sigma in just 10-15 minutes total. Keep it stored in a protected, dry area when it’s not in use, and it’ll be ready to go for the next cleaning – whether that’s tomorrow or next summer.

Of all the bells and whistles that come on the Sigma, the very best one is the tangle-free swivel. This patented feature was a groundbreaker when the Dolphin engineers created it several years ago. Without it, maintenance would quickly and easily become a bonafide nightmare with an inevitable tangled hassle. But the tangle-free swivel on the cable has a full 360-degree rotation, preventing the power cord from wrapping itself into an impossible mess. As longtime pool owners, we give Dolphin all the applause for making our lives easier with the tangle-free cord feature. If you’ve ever had to untangle a pool cleaner cord with the hot sun bearing down on you in the middle of July, you’ll appreciate it too. It’s an absolute game changer in the pool-cleaning industry.

What Could be Improved?

To speak candidly, there’s not much to improve with the Dolphin Sigma. It genuinely runs like a commercial grade robotic pool cleaner at a consumer price.

That being said, it is pricey. It is not for the faint of financial heart. However, we do think it is worth the price tag. The energy efficiency alone compensates for the up-front cost in the long term, and it’s the most intelligent pool cleaner on the market currently. Not to mention the 3 Year Warranty.

As we mentioned before, the MyDolphin Plus app is good, but it’s not great. It’s user friendly enough, but it may frustrate users who aren’t tech-minded. But the app is almost a necessity to operate the Sigma, as you can only schedule the Sigma on the app. However, you can manually start the Sigma directly on the power supply.

The Sigma is heavy because it uses triple motors that are much larger and more powerful than motors found in regular commercial pool robots. We think the few extra pounds are worth it, but you may want to order the caddy so you can make transporting the Sigma from the pool shed to the water easier. It also comes with a convenient cord storage system so you can easily wrap the 60-foot cord, much like a vacuum cleaner.

What Ultimately Sets the Sigma Apart?

A Winning Warranty

You’d be hard-pressed to find a plain chair with four legs that has a three-year warranty, much less a state-of-the-art robotic pool cleaner. But Sigma offers one of the longest limited warranties on the market – three years – backed by Maytronics. Plus, it has a 30-day money-back guarantee, so you can return it if it’s not the right fit for you.

Smart Technology

Like a Roomba for your pool, the Sigma has the technological chops to map and memorize the layout of your pool, creating the best and most efficient routes for quick and hard-hitting cleaning. Plus, the addition of gyroscopic technology makes it faster, more powerful, and more efficient.

Power in Full

We mentioned the three DC motors earlier, but it’s important to appreciate the full effect of their power. Working alongside the gyroscopic technology, the Sigma’s motors lend themselves to a higher flow rate, more suction, and faster cleaning times overall. Not to mention they eat up way less of your electric bill than lower quality pool cleaners.

All in all, the Dolphin Sigma is one of the best robotic pool cleaners you can buy today. It isn’t cheap, but you also get what you pay for (and then some). Having seen many, many robotic pool cleaners at work over the years, we can wholeheartedly say the Sigma is one of the best investments you can make for your pool. Best of all, it’s compatible with virtually every pool shape, and surface up to 60 feet. So no matter the shape and size of your aquatic oasis, the Sigma could be the game-changer you’ve been waiting for.


Dolphin Sigma
Robot Class: In Ground

Features

Waterline / Tileline Cleaning

Clean where other robots can't.

90% of the bacteria in your pool is on the waterline. Don't get confused with robots that are "Wall Climbing". There is a big difference. Waterline cleaning means the Dolphin Sigma actively scrubs and sticks to the waterline scrubbing away this problem area in the pool. It is a feature you don't want to miss.


Dolphin Sigma Wall Climbing

Wall Climbing

Provides floor and wall coverage

Dolphin Sigma is able to easily clean your walls of your pool.The Dolphin Sigma combines wall climbing with the even more important waterline cleaning to provide a deep clean in your pool, giving you full floor, wall, and waterline coverage in your pool.


Smartphone App

Control the Dolphin Sigma from anywhere.

With the its myDolphin Plus smartphone app, you can schedule cleanings, manually control, and fine tune your Dolphin Sigma.


Sigma Gyroscope

Gyroscope

Gyroscopic Sensors allow the Sigma to Navigate Your Pool With Ease

Gyroscopes detect the orientation of the robot by measuring linear acceleration and the angular rotational velocity. The advanced sensors monitor and control position, orientation, direction, and rotation. The Sigma's gyroscope sensors provides constant, precise information to the microprocessor for more effective cleaning coverage, superior climbing and wall/waterline cleaning.


Anti-Tangle Swivel

Anti-Tangle Swivel

No more tangled cords.

With an anti-tangle swivel, the Dolphin Sigma can fully explore and clean your pool without ever getting stuck. The innovative design allows the robot to move freely 360 degrees around your pool, without ever knotting the cord.


Oversized Top-Loading Filter Cartidges

Top Loading Filters

Largest Cartridge Ever In a Pool Robot

Dolphin Sigma cleans down to 2 Microns, allowing you to capture all the leaves, dirt, algae, and other debris easily.


Energy Saver

Ultra Efficient

Save hundreds of dollars a year while cleaning your pool!

Dolphin Sigma saves hundreds of dollars a year in energy when compared to pressure-side or suction-side cleaners.


Dolphin WiFi Power Supply

Plug and Play

Simply Plug Dolphin Sigma in and start cleaning!

Set up has never been easier. No installation needed. Dolphin Sigma is ready to go right out of the box. No extra pumps, plumbing, or anything else needed. Simply plug Sigma and start cleaning!


Dolphin Sigma Smart Navigation

Precise Navigation

Powered by SmartNav 3.0™ Technology

SmartNav 3.0™ coverage is powered by an advanced navigation system. This technology ensures that the most effecient route is used to clean your pool floor. So smart, the system automatically navigates around obstacles and quickly returns to its route.

Videos

Pool & Shop

Where To Buy

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Buy at Amazon.com $1647 In Stock (Prime eligible) Shop At Amazon
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Looking for the best deal on the Dolphin Sigma and other robotic pool cleaners? Look no further, we have you covered. We searched the web and found the best deals on Maytronics, Aquabot, Polaris, and other cleaners.


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Customer Reviews


Sigma Robotic Icon
5 stars 4.9 Based on 693 Reviews

Featured Reviews:

4 stars
Excellent "smart" pool robot gets the job done

Nicholas Parker - Reviewed in the United States on May 18, 2022

These are some of my thoughts on the Sigma. I have attached photos and a video too. PROS - There aren’t any options so that makes it easy to use - Excellent navigation and covers the whole pool (minus stairs – see below) - The cable simply does not get tripped up because of the swivel near its connection to the robot - Relatively easy to clean out the filters once you get the hang of it - Customer service is outstanding! - Fun/relaxing to watch, especially when it rises above the waterline CONS - Does not get typical stairs. It can’t climb up onto mine, too narrow. - Only one cleaning mode (the whole pool – walls and floor) - Can't handle large amounts of debris (see "capacity" below) - Manual control suffers from latency between your phone and the robot. Hard to use. - No notification when it's done, at least on Android. It does provide the exact time it will end though. VIDEO: The video shows the Sigma climbing the pool wall and cleaning the tile. Notice how she gets sort of cornered by the steps and how well she handles getting out of the situation. Doesn't get stuck and stays on her "feet" (rubber tracks). POWER SUPPLY The power supply in my photo is the current one. Just one button. There is more in the MyDolphin Plus app. You can start the robot with a press of the button but I usually start it with the app. CAPACITY I don’t think the Sigma can deal with a LOT of debris on the bottom of the pool. I assume most pool robots would have trouble in my situation. I have one area that collects a lot of leaves (a dead zone). I think it overloaded the Sigma. I don't expect her to handle that much. I had to pull her out and clean the filters mid-cycle, then start over (wish you could just pause it). Now, I run the net across that area to scoop out some of the leaves. The Sigma picks up what’s left and cleans up everything else in the pool. FILTRATION It comes with two sets of filters. I would say one set is "regular" and one set is for "fine debris." I usually use the regular. If I am concerned about algae, I have run the robot twice, once with the regular and once with the fine. Remember that while it's working, it's also filtering your water. My photo shows the fine filters and the white cartridge bodies. CADDY (sold separately) It's expensive for what it is. Entirely plastic. You assemble it. It holds my Sigma but it doesn’t seem like it was meant for it. You can attach the power supply to it which fits perfectly and put the wrapped up cable on it. You can also get a dust cover to go over the whole thing (very important in dusty environments like mine). It’s way more expensive than it should be but there aren’t many choices. BIG CLOSING TIP – HANDLE AT AN ANGLE… In case you miss it in the instructions as I did… You want the “handle” to be at an angle. For example, put one side into the hole closest to the front of the robot then put the other side of the handle in the hole furthest from the front. This will leave you with the “handle” at an angle. This makes the robot move along the waterline (left or right). Experiment with different placements and you will make it go faster or slower, right or left, along the waterline. If you just leave the handle straight across, it will climb the wall and stay in that one place. Watch my video and you can see how the handle is at an angle. ----- The bottom line is I am satisfied with the Sigma purchase. I appreciate its "intelligence" (gyroscope aided) when cleaning. I don't think I need more cleaning modes but it would be nice to have options. In general, if I am going to pull it out, I want it to do the whole pool. I wish the manual controls were less finicky, especially when retrieving the robot after it's done. Finally, a simple request, give me a phone notification when it's done (maybe it's just my phone?). Hope this helps!

5 stars
It really works, but it has overhead time.

Amazon Customer - Reviewed in the United States on September 30, 2022

It does a good job cleaning your pool. I bought it because the standard suction attached, non automated model (I think a Polaris, I've tried other models over the decades and they all sucked, no pun intended) kept getting jammed and didn't seem to go all around the pool and get everything. So finally I broke down and bought this. It's not "automatic'" and no effort....there is some "overhead," you have to plug it in, connect it, unfurl the cable, and put it in the pool and turn it on, and then when it's done you have to take the filters out and shpritz off the shmootz, and put it back on its holder and furl up the cable again and put the cover all, all of which probably takes fifteen minutes for the whole cycle. Not the end of the world. Cleans really well. But if you can get one of those plain old ones, and not have to take this thing in and out and clean it up etc., you're better off IF you can get it to work (which like I said, I couldn't) and avoid all that overhead, not to mention this is a pretty pricey little monster, even if one of those $400 jobs craps out every year or two I think your overall cost will be lower than buying this sucker. But I'm glad I bought this, it does a good job.

5 stars
It’s a beast!

Disappointed - Reviewed in the United States on September 14, 2022

Purchased this unit at the beginning of the year for our new pool. Pool was filled before sod was put down. Lots of windy days with fine sand getting blown into the pool. This little guy with the fine filters went to work and on the first pass removed 90% of that fine sand. Being a newbie to a DE filter I messed up reinstalling the grids after cleaning and filled the pool with DE. This guy went to work and cleaned up my mess. As far as it’s cleaning ability it’s awesome! It has never once gotten stuck on the drains. The WI-FI features so far have worked as advertised. The only bad things I can say about it are the lack of different cleaning options. It’s all or nothing. That needs to change. The only other negative is if you want to try and drive this thing with your phone your in for a treat. For those that have ever flown a RC airplane you will know what I am talking about. Where right is left and left is right. Lol As long as it is moving away from you right is right and left is left. Coming to you left is right and right is left! Got it? Lol Great product and a recommended buy.

5 stars
Thrilled To Have Replaced Our $200/Month Pool Guy With Bob!

Anna - Reviewed in the United States on August 18, 2022

Have had robotic pool cleaners in the past but were underwhelmed. But, we recently re-ran the math and decided to try again. Soooo well worth it! We've been using 'Bob' for over a month and he's the best! Our pool is ~35+' and odd-shaped but he industriously cleans the steps, muscles up the sides to scrub the decorative tile squares that ring the pool, and zealously vacuums the silt on the bottom. We're in a high-desert southern New Mexico area with small shrubbery (pine but few leafy trees) and a dirt road--a road with a flour-like silt that gets into everything. We're a senior couple but able to move Bob to the pool where he then takes over. The unit 'floats' up to remove from the pool but is somewhat heavy until all the water runs out. Cleaning the filters is a simple process (although somewhat terrifying to find out how much and what has taken up residence in your pool). (Note: We have not yet used the wifi function so cannot respond to that aspect of its operation). Bob is a superb bot and not once have we had to wonder if he'll show up on Friday and if he'll actually spend more than 15 minutes 'cleaning' our pool! Bob rocks!!

4 stars
Excellent cleaner, but only has one cleaning mode

RobinD - Reviewed in the United States on August 15, 2022

Overall, we’re happy with the cleaner. It does an excellent job of cleaning our pool. The fine filters do a great job of removing sand and any algae. My only issue, is lack of functionality. The manual shows additional cleaning modes, such as ultra clean, floors only, etc. however, those are only available to owners with remotes. The rest of us only get one option, a 2.5 hour regular cleaning mode. And forget about purchasing a remote, they aren’t available here or on Maytronix website. I was under the impression that those functions would be available on their app . . .it is not. So, if you buy this cleaner, don’t expect anything more than just one cleaning mode.

4 stars
Product good. Customer service BAD

MikeD5551 - Reviewed in the United States on August 24, 2022

The product is good, but make sure you understand the power supply is NOT waterproof. Surprise rain and got some water in the unit. Sent back under warranty and its now been 2 months. Sent me a power cord with no power supply. 2 weeks later the power supply arrived. The bracket to attach the power supply to the power corn isn't included. Sent 2 emails (no response) and have had to call 3 times. Nobody can explain why it wasn't included. Said they will send. Not holding my breath. Really poor customer service for a warranty repair.

4 stars
great cleaning but re-learns pool every time.

Vincent Medina - Reviewed in the United States on August 27, 2022

This unit has made the water in my pool so clear. It is amazing the tiny particles that this unit is ale to filter and the suction makes a wake in the pool. It's crazy how powerful it is. I have two small complaints. 1. It is very difficult to steer manually. 2. It doesn't remember the pool. It maps the pool over and over every time. It would be nice if it remembered the pool and would clean in a back and forth patter instead of continually returning to the middle to remap pool.

4 stars
Great cleaner for the price but WiFi?

Kate Wells - Reviewed in the United States on July 4, 2022

The robot itself is pretty well engineered, never tangles and always removed all the fine grit, leaves etc. But, It’s not great at waterline drift or climbing onto ledges or shelves, even well below surface. This is not bad news, since it’s probably better than most any other retail cleaners. Most annoyingly the WiFi module is a pretty cheap low grade device, it’s range is very poor compared to a modern module. Once again this is not terrible considering it’s typical of the pool industry’s technology. I have the PSU roughly 1m away from a WAP, (other side of a glass window) the App shows 2 bars (red) for signal strength compared to nearly 100% on an old iPhone. It works a lot better on Bluetooth only, if your home, in which case it’s quicker to just press the big button. As I am an industrial embedded systems engineer, I am tempted to open up the PSU and either install an external antenna or better, a modern WiFi module, although this would likely need some intelligent communication with the design team. (Protocol etc). All in, it has met my expectations, although I hoped the bar was higher. Perhaps, with better WiFi and some machine learning this could be a truly world leading product. PS wish the App was less annoying and more analytical.

4 stars
Great cleaner, but a couple issues . . .

Z-Man - Reviewed in the United States on July 5, 2018

1) It gets hung up on the main drain at least once per cleaning cycle - like a turtle on its back. The tracks are on the sides, and brushes are front and back, with nothing moving in the entire central under-belly. If the robot drives up on the main drain dead-on, it gets stuck and can't get itself free. A light tug on the cord sets it free and it continues without any problems. However, when running unattended, this has been a big issue. It got stuck at the beginning of the cycle one time, and I didn't notice until near the end of its routine. There are a few devices on the market that make a ramp (like a ring around the drain), and clips that create a dome over the drain cover. These options are ~$50, last only a few years, may be difficult to assemble, and reviews are generally horrible. But someone posted an interesting solution, and I've been trying to make it work. That is, screw a 1" PVC cap (with stainless screw & washer) to the main drain cover to create a 'dome'. It should lose balance when it tries to climb the dome, causing at least one track or brush to contact the pool bottom. My first attempt didn't work, because I used a shallow cap. My next attempt will be to use a cap & pipe (as an extension). Making it taller should do the trick. Associated problems were: - weighting my self down so I could stay on the bottom (weight vest + weights on a tool belt + mask & snorkel - pre-drilling the hole for the screw. I held onto a wood spade bit by hand, and worked it to get a hole started - staying on the bottom while applying force to pre-drill, then use the screw driver. I used a garden claw to hook onto the main drain with one hand, while working the tool with the other. - Interesting experience . . . but totally doable. Just make sure you have someone spotting you and extending a pole for you to grab onto when you come up for air. Or . . . find someone with scuba gear :) 2) The remote (blue tooth with smart phone) works, and I've used it successfully to get a few spots the robot missed (especially after it gets hung up on the main drain). However, response time between action & reaction is poor, and I usually over-compensating on turns. It's frustrating trying to get the thing pointed in the right direction . . . but it gets the job done . . . eventually. 3) No caddie. I wrote to the manufacturer and didn't get a reply. I eventually put the power supply in a patio box to keep it out of the weather, and I leave the robot in the water all the time, so not having a caddie hasn't been a problem. All-in-all, I'm very happy. The pool hasn't been this clean - ever! On the plus side: 4) Its completely self-contained. 5) Filters only need to be cleaned every couple/few of weeks. Cleaning is very simple because filters are top-loaded & easy to remove. Then use garden hose to clean. 6) No suction hose to lay out and prime. 7) Skimmer baskets don't get plugged, thereby creating reduced pressure and suction on the vacuum hose. 8) No debris goes into the filter, so I backwash less often - less water loss, and hence, fewer chemicals lost. ================== *** 2 Month Update *** ================== My biggest complaint was (#1 abv.) the robot getting hung up on the main drain. Perhaps I wasn't being fair to the robot, and should clarify that this problem is not specific to this robot, since many people experience the same issues with other robots. Abv. I said I'd try a taller 'post', which I did, and it didn't solve the problem. The post I bolted onto the main drain cover was ~2" tall, but the robot would happily climb on top of it, then balance itself perfectly with all tracks and brushes suspended - not in contact with the bottom. I think the handle is designed to balance it. Anyway, I thought about modifying the bottom of the robot, but didn't want to void the warranty. In the end, I decided to lower the main drain cover by building a custom cover out of a 10" wide x 1/2" thick HDPE cutting board ($6 from the Job Lot). This solution has been working flawlessly for a week now.

4 stars
Good coverage

Bama Road Rage - Reviewed in the United States on July 29, 2022

It uses some type of algorithm to clean my whole 20x40 foot pool. It's not 100% coverage but what is? I still have to break out the pole and brush to get all of the stair corners and near the ladder. It appears to be well built and super easy to clean out the debris traps. Really, my only complaint is that it always gets stuck when it rides over the bottom drain cover. I have to physically move it to a new spot so that it can continue. I do wish there was some type of feedback through the app to let me know it is stuck, like my robovac. After all it is WiFi capable.

4 stars
Seems pretty good

Benjamin Owens - Reviewed in the United States 🇺🇸 on April 30, 2022

I was pleasantly surprised at how easy and straightforward the setup was. I have the remote controller box about 45 feet from my router, in a covered location and it has had 0 issues with connectivity. The vac does a great job on the pool floor and I see it cleaning the waterline on occasion. It does fill with leaves fairly quickly, but I don't have a huge leaf problem so it's no bother. The filters are fairly easy to clean. If I can get 5 years out of the vac with little maintenance overall, I'll be satisfied. Wishlist/Cons: > The vac gets stuck on my drain and I have to pull it off manually. Plan is to devise a drain clip on remedy to keep the vac off. > I have cord tangle issues. As recommended, I shortened the line to exactly what is needed and still have a significant twist to untangle about every 3 runs (pic attached). The vac loses range under these conditions. > I wish there was a clean mode focused on the waterline. I just have one cleaning mode - standard (admittedly nitpicky - a competitor has this feature). > Why can't I schedule a cleaning twice a day??? There's a limit to once a day. I have a leaky sand filter and would like twice daily runs to keep the bottom clean. > Occasionally I see leaves/trash in the fan on top of the vac. This hasn't caused a problem (yet), but it seems as though the filters leak a bit. Once a qr code sticker from inside the vac was caught in the fan. I removed it fairly easily. Overall, I am satisfied (thus far). The cord twist issue might be a manufacturer defect. I put in an Amazon question regarding it, and the consensus was that cord twist/tangle isn't an issue for most, so I might have to take it up with Maytronics. I plan to update again with any significant experiences.

5 stars
Easy to use, great little cleaner, cleaned up my algae-riiden pool in no time!

Patrick - Reviewed in the United States 🇺🇸 on August 13, 2022

The robot is a solid A, it cleaned my algae-riiden pool, picks up large objects such as acorns with ease, and could not be more simple to use and clean. The remote control from the app is adequate but lags the inputs a little, however this is a minor annoyance. My only regret is I did not buy one years ago. The time savings is tremendous! I'll never be without one again. As you can see from the photos, my pool went from green to chrystal blue in a little over three days. I ran the robot about seven times over the three days and it did a superb job.

5 stars
Some tips to share and great customer service experience

Brian Wong - Reviewed in the United States 🇺🇸 on December 15, 2021

The robot cleans my 30K cubic foot in-ground pool extremely thoroughly, except for the sun deck which I expected, and is easy to clean out. Here are some tips I learned along the way. 1. Buy this instead of the Dolphin CC Supreme if you have a light plaster pool. The Supreme was my first purchase and as others have described, the black plastic housing can leave black streaks on the plaster. Yes it can be scrubbed off, but it takes a lot of time and effort with a metal brush or sponge. The Sigma doesn't have this issue since it has a white plastic body. 2. The bad news; unlike this Supreme, the Signma would get stuck on the VGB main drain. The reason is that the Supreme has a center brush, whereas the Sigma only has the two front and back brushes which aren't able to push it off the drain. 3. Customer service was very responsive and pleasant by email and they first sent a list of solutions for the owner such as moving the float arms forward or drain modifications that can be purchased separately. However, these solutions either didn't work or were not available for our specific drain (MDX-R3). Some of the forums also suggest adding another float or putting teflon on the bottom but these seemed janky for a $1,500 robot. Maytronics then suggested I send the unit in to have a 3rd center brush installed! I was very happy about this as now I would have the same brush configuration as the Supreme but no streaks. I sent it to their repair center out of state and it was shipped back within a couple of weeks. The robot now works flawlessly with no issues getting stuck on the drain and no reduction in the cleaning efficiency. Although it took time and would have rather have had it work right out of the box I need to give kudos to the great Maytronics customer service team! 4. Some improvements could be made: The "massive" cartridges are actually not so large and can be filled quickly if there are a lot of leaves (usually after a storm). There is only one cleaning mode at 2.5 hours whereas the Supreme had several including a shorter 1.5 hour cycle. This seems like an unnecessary "nerf" to an expensive robot. The app is not stable and often needs to be closed and reopened before it will connect to the servers. There is no alert for a full cartridge that is available on some of their other models. Finally, ADD THE THIRD brush so other owners don't have the drain issue.

5 stars
Exceeding my already high expectations

Dave H - Reviewed in the United States 🇺🇸 on April 18, 2020

This isn't a cheap product by any means, so my expectations were pretty high. I previously had an AquaBot Elite for the last 3 years, which worked pretty well until one of the motors decided to stop working...conveniently just as the warranty expired. Don't get me wrong, the AB Elite was overall a good product...but this Sigma seems far superior. While I'm only 1 week into my ownership of the Sigma, it's noticeably better than my AB Elite in: 1. Suction power - My AB Elite would tend to skip around the pool floor when it stopped and started (or turned) because its suction wasn't powerful enough compared to its drive motor. The Sigma never loses contact with the pool floor. And, I see it sucking more debris into itself that's not directly in its path...something I didn't notice much with the AB Elite. 2. Getting stuck - I haven't seen the Sigma get stuck once yet. It put itself into a strange position on my pool steps where I was sure it would "turtle" on its back and I'd have to reset it. Nope! It corrected itself very quickly. My AB Elite would often struggle and get stuck at inside and outside corners of my pool wall and floor. It would take up to 10 minutes to correct itself, just sitting there spinning. Because the Sigma has 4 independent spinning brushes that allow it to turn in a full circle, it easily maneuvers and climbs walls at any angle. 3. Brushing the waterline - The Sigma is very impressive here as compared to my AB Elite. When it climbs and cleans the waterline, it typically goes 3-4 feet in one direction (and sometimes back again). It's very thorough. My AB Elite seemed to get lazy here and in some cycles, I noticed it didn't clean the waterline much at all. I'll be interested to see if the Sigma continues this same output over time. 4. Remote control - I didn't have remote with my AB Elite...because I didn't purchase that function. With the Sigma, the Remote App works pretty well. Like others have said, you do have to stand close to the power supply box because the Bluetooth isn't very strong. It also takes a little getting used to as there is a bit of lag between your input and response from the machine. But, overall, it's a cool feature for a quick spot clean. 5. Filters - I first ran the Sigma with the pre-installed "normal" mesh filters because I had some leaves and larger debris. Within the first 2.5 hr cycle, my pool was spotless. I then decided to run a second cycle immediately after with the Ultra Fine (corrugated) filters to see what else the Sigma would pick up. It was very impressive how much fine particles were trapped. I can see how normal maintenance with these filters can save you on chemicals. I really don't have any criticism of the Dolphin Sigma at this time. It seems like a great product and I highly recommend it to anyone looking for a robotic pool cleaner. I did a ton of research before buying and am always skeptical of these cleaners because there are so many variations out there, and every manufacturer has many options.

4 stars
Works after some necessary enhancements

S. Lee - Reviewed in the United States 🇺🇸 on February 6, 2022

I'd really like to say this design works as it has almost all the feature people would like to have in a pool cleaner. However, it simply was BADLY DESIGNED for the common pool Main Drain. The robot gets "stuck" on top of the drain. In a single run, I had to pull it off 5 times manually by pulling on the power cord. You can't even use the remote control drive because its stuck on top of the drain off the wheels. It just can't get off the drain. Its a colossal failure given the high cost of the robot. Was this even product tested? I have had to resort to putting rubber covers on the main drain in an attempt to give the robot something to ride over the drain with middling success as it also tends to move the caps off the drain. Complete waste of money. Something which is supposed to be fully automated now is very manual. ==UPDATE 02/08/22 Maytronics responded by support email that they could do a physical enhancement by adding another roller to the bottom of the robot which would prevent it from becoming stuck. I will be sending it back for enhancement and will update reviews. ==Update 02/27/22 I sent the Sigma to Maytronics repair services . They paid for Fedex shipment and labor so I do not fault their support it was very good. Within a couple days, they modified the Sigma Pool Robot with a 3rd roller on the middle bottom of the unit and sent it back to me. This actually prevents the robot from being stuck on the main drain of the pool as there is now a roller there where the drain used to get stuck. First time today the robot ran the whole pool without getting stuck. I'll update reviews again later after a few months of usage to report on the actual quality of cleaning.

4 stars
all most great!

Michael W - Reviewed in the United States 🇺🇸 on August 14, 2022

Loses Wifi connection, most all the time...cleans like crazy!!!!! Clear water!! easy to clean!!! But cant use app because of wifi/bluetooth issues!! FYI all other wifi products i own work fine outside

4 stars
So far, so good.

LON - Reviewed in the United States 🇺🇸 on August 20, 2022

The media could not be loaded. Cleans pretty good. Gets to steps and water line. Wish it would notify when the filter is full. Don't drain it in the pool when you take it out or some debris may go back into the pool. I thought it was going to flip over on the step (see video) but it corrected itself and kept cleaning. The filter picture is after cleaning from a heavy rainstorm.

5 stars
3cPoolio Cleans Up!

JRL - Reviewed in the United States 🇺🇸 on August 8, 2022

Dolphin's Sigma robot pool cleaner does exactly what it purports to accomplish; a clean pool bottom. The robot does a great job on large leaves to small particulates that tumble into our large pool. The Energizer Bunny has nothing over Sigma; it just keeps on going and going until the job is done. My ONLY druther would be an improvement of the remote manual control using my iPhone. Notwithstanding that minor need, I would recommend this cleaner to anyone wanting to ensure a clean pool for the entire season.

5 stars
Expensive But WasWorth It

msswb - Reviewed in the United States 🇺🇸 on July 24, 2022

Love this pool robot! It amazes me it has enough suction to cling to the wall, surface and bob up and down cleaning the waterline! It not only does a great job at the waterline but everywhere else as well. It won’t clean the tanning shelf or the steps. The water is too shallow for its liking and the steps are an odd shape so no cleaning there. But I will gladly trade 5 - 10 minutes of brushing those for a superior job on the rest of the pool! The filters are a snap to clean. Have not had the chance to use the remote yet but I’m sure I’ll be pleased! Glad I spent the extra! It’s been worth it!

5 stars
Amazing

Sherry Franklin - Reviewed in the United States 🇺🇸 on August 10, 2022

We purchased this pool cleaner and we absolutely love it. This cleaner is very thorough and my favorite part is it does not get stuck or tangled up like our previous vacuum. Our pool is more free form vs a rectangle and it doesn’t create any issues for this vacuum. My only regret is that we didn’t buy it earlier. We did as lot of research and glad that we chose this model.

4 stars
Maytronics customer service 👍

ScottLegend - Reviewed in the United States 🇺🇸 on April 22, 2022

This high end robot does not clean the waterline, I have watched it clean 3 times and it barely addresses the waterline. The remote control feature is so delayed it’s worthless. I have a WiFi router very close with 940 mps down and up speed. I tried using the remote feature standing very close to the power supply and still the lag makes it unusable. The Maytronics customer service is very poor. The people that try to help you do not have a sufficient understanding of the product, thus opinion is based on 3 separate calls. I will be searching a different brand altogether. 4.26.22 update: Maytronics reached out by email and sent me some detailed tips on how to get better waterline cleaning. The results are much better. The remote feature is still less than desirable. They also sent me a prepaid shipping label and an offer to install an additional brush, which I will take them up on.

5 stars
Well worth the money!

Donny Boston - Reviewed in the United States 🇺🇸 on May 25, 2022

I owned a Dolphin M200 that made it 13 months and really wanted a robot with remote control capability so when the old one stopped working I went ahead and took the plunge (pun intended) on this bad boy and am so glad I did. Right away you can tell the difference in suction and how that plays into cleaning, our old robot didn't climb the steps into our splash pad even when brand new, this one still does even a year later with no issues. There isn't an area of our 35 foot rectangular pool that it doesn't get into and it is able to get itself free from being stuck I'm guessing due to the gyroscopic doohickey that's built into it. When we got the pool in 2020 I had visions of kids vacuuming and building character but the robots have taken that away, it is cool to watch with a cold beverage on a spring or summer evening though and the scheduler on the app makes it easy to ensure that we can keep the pool clean when we are away for a few days or a random storm pops up while we are out and about. Don't think just buy it and know you made the right choice, it truly is an awesome pool robot!

5 stars
Unbelievable tool. Love it!

James L. - Reviewed in the United States 🇺🇸 on September 5, 2022

After 1 month os uage it simply does excellent. Cleans and scrubs and climbs up on steps.

5 stars
SIGMAN the pool cleaner makes me love my Pool again!

Michael Low - Reviewed in the United States 🇺🇸 on July 19, 2022

Great product! Bought the Dolphin Sigma Pool cleaner and as advertised it does what it says. In a little over two hours the pool ( 20’ X 40’ in-ground ) is completely clean. I used to spend hours outside in the hot Sun cleaning the pool with a pole and weighted roller suction device plugged into the skimmer return. The process was time consuming, clumsy and not enjoyable to do. Now I look forward to cleaning the pool again. We Bought the Dolphin Sigma, Cart (must have) and Cover, I would highly recommend doing the same….Again GREAT, GREAT Product…

4 stars
Cleans and filters

Dennis E. Cox - Reviewed in the United States 🇺🇸 on May 10, 2022

Heavy to lift from pool, nice if it would always return to position it was put into the pool, electric cord should be longer or state gage of extension cord that can be used. I have a 15-foot cord with 14-gage wires that would probably be adequate. Very easy to clean, does not show any signs of collecting pool debris like some other suction cleaners. Move up walls onto rocks and even went up on two different stairs. Remote control direction movement takes some getting used to. I would buy it again ... Helpful support when having trouble resetting password on App.

3 stars
Overpriced with gimmicks you don’t need

S. Morris - Reviewed in the United States 🇺🇸 on June 6, 2022

Let me start by saying that this robot does an amazing job cleaning my pool. I have a 40’ kidney shaped pool with built in stairs and platforms and it navigates them all with ease. It cleans the pool thoroughly in around 2 hours, and cleaning up is really easy compared to robots that use a bag type of filter. It does all of this without any need to ever open the app, or use the wifi connectivity. The remote control app itself is pretty much useless. Trying to spot clean areas with it is nearly impossible because there is a huge lag between what you tell the app to do and when the robot actually executes your instructions. If it even executes them at all. The only useful thing about the app is that you can see on your phone when the cleaning cycle is complete, which I guess is useful if your pool is not visible from your house, and for some reason you need to immediately know when the cleaning cycle is done. Does the robot clean your pool? Absolutely! Does it do a good job? Yes! Is it worth double the price of some of the other Dolphin cleaners? IMO not even remotely. Save your money and buy one of the cheaper robots and avoid the gimmicky apps, they are just frustrating to use and way overpriced.

4 stars
Not good for leaves in the pool. Upate.

Paul E Reed - Reviewed in the United States 🇺🇸 on March 27, 2022

If you have no leaves in your pool, then this is probably a great product. In my case, I have a gigantic oak tree that overhangs the pool, so is lot of leaves to deal with. I thought this would pick them up, even if I had to empty it often. But reality is just a handful of leaves clogs up the intakes. So if you are looking for something to Bush the walls, then this would do the job. If you have leaves, then not the right product. Update. Found a different way to deal with the leaves. Been running it frequently and am pleased with the general cleaning and removal of fine grit and small debris. Still 2 stars on leaves, but 4 stars on general cleaning.

5 stars
Information

Amazon Customer - Reviewed in the United States 🇺🇸 on June 7, 2022

Needs more information about the app and the Dolphin on how to switch from suction to the dolphin and on how to use it this is new to me I have always used suction cleaner and I was not sure about how to switch over to the dolphin I had to call the dolphin help line to clear thing up I run my pool pump 8 hr a day and the dolphin you can only run for 2 1/2 hr a day unless you run it on manual and they recommend not leaving the dolphin in the pool all the time so there for you have to put the dolphin in and out of the pool every day now I have to run my pool pump for 12 hr a day they say the dolphin is the best well I will see

5 stars
Great investment!

cory beal - Reviewed in the United States 🇺🇸 on September 2, 2022

The media could not be loaded. I was nervous buying this as it had mixed reviews online. It worked right out of the box for me and I have used it about 10 times and have been satisfied every time. Makes life easier for the diy pool people. I love this product and recommend it 1000 %.

5 stars
Worked right out of the box

Amazon Customer - Reviewed in the United States 🇺🇸 on March 30, 2022

Wow!!! First-time pool owner. Freeform 13,000 gallon pool. Did a lot of research here comparing brands and models. Although one of the most expensive ones, I like the features and the 3-year warranty on the Sigma (also purchased an additional 3-year warranty from Amazon, so covered for 6 years). The instructions included seems a little "light" but great videos on their Web site. Place the Sigma in the pool, I hit start, and just watch this thing go to work. Climbed walls, cleaned waterline and steps... Although many wrote it gets hung up on the pool drain, I had no issues. The only area it did not do was the raised "sun deck"… I guess the water was not deep enough there. After running for about two hours, the pool was spotless. Easy to clean baskets. I also downloaded the Web app to my mobile device (Android Pixel) without any issues, but not really sure, based on its automatic function, it is needed. I'll follow up in a few months to report on its reliability Now mid July.... Absolutely no issues. Extremally happy this was my decision. If I had to make one recommendation... wish it was a little lighter (heavy when removing from pool)

5 stars
The Best Pool Cleaner!

CLIFF E. JACKSON - Reviewed in the United States 🇺🇸 on June 7, 2021

I couldn't believe I was spending this much money for a pool cleaner but I am absolutely thrilled that I did! This cleaner is replacing my 18 month old Polaris Quattro Sport. Yes, I thought I had a good cleaner with the Quattro but it broke a wheel off and while it was down, I went ahead and spent $450 to replace all the internal parts. I was hoping to get a least another year out of but it broke another wheel. I looked around and decided to replace the Quattro with a Polaris P-40. The P-40 is a similar model and thought I would keep the old Quattro for spare parts. But before I purchased another Polaris, I thought I would research the new Robotic cleaners that use electricity rather than a booster pump. Long story short, the Dolphin models kept coming up as winners in comparison testing. When I drilled deeper, I found the Sigma was by far superior. It has all the bells and whistles like WiFi operation, pool shape scanning, wall climbing, tangle free cabling and energy efficient. This cleaner is powerful and easy to clean. It only takes 2.5 hours to clean our 18' x 36' pool. This unit will handle a pool up to 50' in length. My old Quattro would tangle up constantly and on occasion, would find its way out of our pool at the zero entry. Not the Sigma! This unit will detect it's in too shallow of water and after 5 - 10 seconds will shut down and then BACKUP into the pool where it's supposed to be and the cable has not once tangled itself in knots. As for now, I absolutely love this robotic cleaner. Time will tell but in the meantime, you couldn't pry if from my backyard. Also, I purchased to universal caddy to store the unit. I'm really glad I did.

5 stars
It seems like it will last for many years and I’m happy about the purchase.

Real Person - Reviewed in the United States 🇺🇸 on November 3, 2019

This is a solid product, took about 10 minutes to unbox and place it in the pool. My Polaris 360 died I did quite a bit of research on replacing the device speaking to friends with Pools and everybody recommended this brand. Long story short the device is working amazingly and cleaned up about a week of debris at the bottom of my pool including a lot of dirt and dust and ash from fires recently in Northern California.Ran it three times now since receiving it earlier this week. Clearly it looks like I’ll be using Robot maybe twice a week to maintain my pool. Couple thoughts about the device, it’s great because i am able to turn my variable speed pump down quite a bit more because I no longer need to power the vacuum that ran the Polaris-there is an immediate savings as far as electricity. The unit is pretty heavy when you pull it out the water, So be aware of that, additionally when the unit shipped it shipped with what I thought were placeholder filters(throw in garbage)-In the box there were additional filters that looked a little thicker so I removed the filters that it had been shipped with and I installed the thicker filters. The documentation that comes with the device is pretty much garbage in my opinion- it doesn’t really explain that it comes with two sets of filters., fortunately I went out and scoured the Internet a little bit and found out that these are called Micron filters-So I’m very happy I didn’t throw them away even though looked like they were put there just for shipping.So the important take away here is do not throw away the filters that ship inside the unit make sure you either decide to use those or the more traditional looking thicker filters. One other odd thing is that the limited documentation did say to store it upside down, so when I take it out of the pool I let it drain upside down, and then I take it to the garage and store it upside down so that the treads don’t get bent. Other than the weight of the device when you pull it out of the water and the shoddy documentation, It seems like it will last for many years and I’m happy about the purchase. Please excuse any odd or misspelled words this message was typed or dictated on my iPhone/iPad

5 stars
Exceeds Expectations!!!

Amazon Customer - Reviewed in the United States 🇺🇸 on April 27, 2022

I have used the Dolphin for two weeks now and it continues to exceed expectations! The attached photo is two days after heavy rain and thunderstorms. I did a 2.5 hour cycle with the regular filters, a 2.5 hours cycle with the micro filters the day after the storms, and a 2.5 hour cycle with the micro filters this morning. I have only used the phone app to set my schedule and to turn on the unit for off-schedule cleaning cycles when needed. I have not had to use the remote guidance, as the unit covers every square inch of the pool (roughly 22'x44'), including the steps and walls, with the exception of the shallow tanning ledge. Everything works as advertised! So far it has picked up leaves and large debris, in addition to the fine particles with the micro filters. Very easy to clean the filters! So far, well worth the investment!

3 stars
Getting worse

Wurb - Reviewed in the United States 🇺🇸 on August 13, 2022

I would have given this a 5 last year, but after the software update, this now gets stuck on my returns at the bottom of the pool. Updates are supposed to make things better, not worse. I really wish there was a way to go back to the old software. And the remote functionality always stunk, but you don’t really use the remote.

5 stars
Excellent

D. Moore - Reviewed in the United States 🇺🇸 on August 13, 2022

Does a great job in our 39k gal pool

3 stars
For the money I paid for it I was hoping for more.

Dorvan - Reviewed in the United States 🇺🇸 on August 6, 2022

I used this robot after opening my pool in hopes that it would completely clean up all the leaves that were left on the bottom of pool after removing my pool cover but instead it's was too much for it to handle. It would make a couple of passes and clog up the impeller. This is made for an already cleaned pool with very little debris in it.

4 stars
Dolphin

Steve Lazlo - Reviewed in the United States 🇺🇸 on May 9, 2022

Dolphin gets stuck on Main Drain only issue I have had as of right now ....very frustrating since this was a purchase of $1,200 for this item

4 stars
Customer service is great

Amazon Customer - Reviewed in the United States 🇺🇸 on January 8, 2022

I purchased mine in November of 2020. The performance was exceptional until December of 2021, when it quit operating. Customer service jumped right into action. It was a little inconvenient, I had to pack it up and ship it back for repair under warranty. That was a $30.00 plus packaging expense. I got it back in about a month at no charge. I don't know what caused it to break, but I leave it in the pool all the time but I'm not sure that's good. Now that it's repaired I will only put it in the pool as needed. With that in mind, I really don't need a robot with all digital capabilities. Still a good unit!

3 stars
in good shape, and worked right out of the box

Nickolas R Smith - Reviewed in the United States 🇺🇸 on June 7, 2018

The unit arrived on time, in good shape, and worked right out of the box. I was up and running in 15-20 minutes. Running it its first night is did a great job cleaning my not-so-dirty pool and the cable was clearly NOT tangled. Note: It does a GREAT job getting above the waterline to scrub the walls. Impressive wall suction and stability. First cleaning of the filters was CAKE. I really do appreciate the top load panel innovation. Note on filters: Comes with 2 sets, it is not clear which filters are the smaller micron filters. Note on manual: Digital manual accessible through the iphone app is klunky and incomplete. Note on marketing:2 stage filtering is mentioned, but I'm not sure how that is really a thing. You can SWAP filter types, but I dont see how to stack them OR where a 2nd stage would be.Perhaps a disconnect on version / part numbers. I purchased this to replace my recently deceased but very heavily used Aquabot T4RC. I was nervous to purchase this unit because there was very little feedback and information to illustrate its long-term value. Obviously the jury will be out on this for some time. I’ll be trying out the daily automation routine through the weekend to see how it does. The phone Bluetooth remote control works SOMEWHAT better than the wonky remote on my old T4RC June 13 2018 update: still seems to work fairly well, observed a noteworthy quirk. When on the automatic daily cycle I noticed the controller indicating it was in the active clean mode, and it clearly was at some point recently, but it wasn’t moving. Checked the app, and it is also indicating that the cleaning mode is active, but still not moving. Activated manual control mode, successfully moved it around, turned off manual control, and it still indicated active cleaning mode but only in its head. I think we found a big in the system. Aug 20 2018 update: After a few months I'm comfortable saying that this unit does NOT clean as well as my old Aquabot T4RC. The Sigma definitely turtles less, and covers the pool faster through superior tracking, but it does NOT get the spots where the sloped side wall meets the sloping floor toward the deep end. I feel this unit has a lot of suction, but it still doesn't seem to get those crevasses where the Aquabot had water jets to blow that stuff loose and into the filter. If the unit holds up for a few years with minimal trouble, it still has potential to be of fair value, but I'm breaking out the pool brush outside of opening day for the first time in 4 years. The "indicating cleaning mode while doing nothing" problem is still a thing. Not a big deal, just annoying.

5 stars
Worth Every Penny!

Stan - Reviewed in the United States 🇺🇸 on June 29, 2022

This is one of the best purchases I’ve ever made! 2.5 hours to a virtually spotless pool! Cleaning the cartridges takes under 5 minutes and the caddy allows for storage until I need him again! I named my Dolphin “Pool Guy” cause he literally cleans like a professional! Excellent product! Very pleased with my purchase!!

5 stars
Powerful tool

Warren Capps - Reviewed in the United States 🇺🇸 on August 5, 2022

Set remote and leave it. Easy to use.

4 stars
Good cleaner but no remote control

Brookemeister - Reviewed in the United States 🇺🇸 on July 22, 2020

Overall, I like it. However, I paid extra for remote control, which is non-existent: I can't use my phone to start or schedule the cleaning process. However, it couldn't be simpler to operate: 1. Connect the power line to the cleaning unit and controller/power source. 2. Put the cleaning unit in the pool 3. Plug in the power/controller and push the start button The only choice it offers is whether to clean every 1, 2, or 3 days. You cannot schedule when it will clean. It automatically starts cleaning at the same time as the most recent cleaning. Given how simple it is, it is amazing how bad their instructions were! They would be much better off if they simply stated what I stated above! It cleans well, except it does not have the power to get up onto the top step or onto the three underwater benches around the pool: It can only get up onto surfaces where the cleaner remains 100% underwater. It has a seemingly random motion that seems to cover the entire pool very well. I'm not sure how well it picks up leaves, especially bigger ones. I've picked up more than a few off the bottom, but they might have fallen into the pool after the last cleaning. I haven't found any leaves in the filter, so either it shreds them or can't pick them up. The two filters are a bit of a pain to clean and seem kind of fragile. It came with one set of replacement filters.

3 stars
Works great, but likes raised floor drains a bit too much

J Marzec - Reviewed in the United States 🇺🇸 on May 27, 2022

This works great in general. The remote controls are really laggy, and if you ever get a new phone or have to uninstall the app, good luck reconnecting to the unit, I never was able to. My biggest issue is it always gets hung up on the slightly raised cover for the floor drain in the pool. The drain isn't large enough for the treads to hit it, so once it rolls over, you manually need to give it a little tug on the cable to get it loose again. Unfortunately, they don't seem to make a flat cover for my drain, and I haven't been able to figure out a way to keep something down around it to help the robot crawl off if it does get hung up.

1 star
Customer support is the worst. Everything is broken and their warranty is aweful

Amazon Customer - Reviewed in the United States 🇺🇸 on August 4, 2022

What a waste of money. I've barely used this over the 3 months of owning it while it worked. First off, the power supply isn't close to being waterproof. Treat it as though any splash of water will destroy it. (They seal the back, but where the top meets the bottom is completely unsealed). If it gets caught out in unexpected rain, for example, treat it like it will be destroyed. When the power supply failed in only a few months of ownership, I had to deal with terrible customer service. Then they say because of delays it'll be weeks before you get a new one. Well, I got a new one eventually, and it works fine with the robot, but it no longer works with the App. There's a software bug that says it has an issue with the robot's serial number. I called customer service and troubleshooted it. I had to do weird things like just create a whole new account with them, but still nothing worked. They said they need to escalate to some guy in Israel who will e-mail me because of the time zone difference. Wow. So basically, now that they decided I have an odd issue, there's no one left to speak with at all. Just send overseas e-mails. Well, weeks go by and nothing. I call back. Typical long holds and dropped calls. Then they say there was a miscommunication, expect to hear from him now. I check my e-mail. No help, just a letter saying to send the whole entire unit in for warranty repair at my expense! Excuse me???? Because of a software bug, it's easier just to make me pay to send the whole thing back? For what? Planning on sending me a refurb, maybe? Who knows! It's been two months without it, and who knows when or if I'll be up and running again. But one thing I do know... Their unit broke in a few months of light use, their replacement part was late and doesn't make the unit work, and now they want me to spend more money on sending back a junk robot. I should have known... anyone that spends so much effort convincing you that their support is great probably has a reason to spend that much effort convincing you!

3 stars
App is Horrid - updated

Beth D - Reviewed in the United States 🇺🇸 on February 1, 2022

I was looking forward to using this, but the (android) app does not work. Nothing functions without that stupid app. Tech support was useless. I guess I have no choice but to return the whole thing. Update*** I was able to get the app to connect by resetting the password and removing most special characters. Not as secure, but it worked. The robot cleans pretty well, but the app is still a misery. It connects to my wifi and finishes a cloud update, but then says that internet is not available(?). It also took many attempts for it to do the cloud update, even though the router is only about 20ft away. I am not able to adjust the time that the robot runs for a cycle. It defaults to 2.5 hours. I would like more options. The app and its connections are slooooow. If you have patience, it does a decent job, but without the bells and whistles that I had expected (for the price). I upgraded the stars from one to three. If the app were better, it would be higher. FIX THE APP, GUYS!!!

5 stars
Love it

Travis - Reviewed in the United States 🇺🇸 on January 30, 2022

I love this robot it easily cleans my pool and walls. I use it to clean my pool and my grandparents pool. It never gets stuck on the drains as people have mentioned. My pool is a basic 12,000 g rectangle pool and has no issues. My grandparents pool is 20,000 g and has far more steps and obstacles. I have to block of their in pool table as it will tangle itself on it but that’s not a con. My pool doesn’t gather much debris but it still cleans far superior to the hours I’d put in monthly. My grandparents pool gathers a ton of debris and lots of sand and small rocks from their multiple rock waterfalls. Our pools have never been cleaner.

5 stars
A Must Have Tech For Your Pool

CJGINC - Reviewed in the United States 🇺🇸 on July 4, 2021

Vacuuming a pool could be one of the worst tasks to take on. Borrowed a friends Dolphin Premier and after doing some more research decided on the Sigma. There is a 3 year WARRENTY and I think I was able to extend it to 5 for $50 more at check out. This thing rocks. Not only will it suck up any larger waste material it also filters the water at an amazing rate and removes fine particles. Owning a pool pretty much demands owning a Dolphin. This one is def worth the spend. It climbs walls and stairs and scrubs everything. I have not noticed any issues with getting stuck on the filters as was mentioned in a few You Tube video reviews. The top load filter baskets are also a huge plus as you don't need to flip it over to clean. Overall, it is an amazing machine that will save countless hours of vacuuming. It appears that it costs $500 to run a pool pump for 5 months straight. This is another point to factor in as you can run the pump much, much less frequently and a Dolphin costs around $0.15 cents for 3 hours of cleaning. It is a for sure buy. *****As a side note after 1 month of ownership I am not sure that it has the capability to climb individual stairs.*****

5 stars
The best pool vacuum cleaner I have ever owned

Customer - Reviewed in the United States 🇺🇸 on July 26, 2022

I love everything about it

5 stars
Great Design

VQT - Reviewed in the United States 🇺🇸 on July 24, 2022

Working good, easy to use.

5 stars
Cleans very well

James Stroud - Reviewed in the United States 🇺🇸 on May 27, 2022

This robot cleans really well. Wish it got the waterline a little bit better. There is only one cleaning cycle available in the app. Wish it had a water line cleaning cycle. Can’t figure out how some of the less expensive robots have different cleaning cycles you can choose.

5 stars
Amazing customer service

Dallas C. Hack - Reviewed in the United States on July 19, 2020

I have changed my review to 5 stars because of Maytronics' amazing customer service. The unit that I was originally shipped hung up on the 1 inch high drain cover about half the cleaning cycles. I sent a note to Maytronics about this issue and, within a day, their customer service department contacted me by email and requested I send the unit to them for an upgrade. They even included a prepaid shipping label. I sent it to them on a Wednesday and by the following Monday the unit was delivered to my doorstep with a replaced chassis that included a center brush. Although it does pause over the drain from time to time, it is able to work itself off the drain with the center brush and continue cleaning the pool. The revised unit has a different & more methodical cleaning pattern. I couldn't ask for better service than what Maytronics provided. The gyro feature on the Dolphin Sigma, which is the reason I purchased this robotic cleaner, works very well. It climbs the walls and never tips over like my previous robotic cleaner did. The bluetooth remote control is mostly a gimmick, requiring one to be near the pool in order to "drive" the cleaner around the pool. This cleaner doesn't have intelligent pool mapping or WiFi connectivity. I now highly recommend this product, as it cleans the bottom and sides of my rather deep in-ground pool very well.

5 stars
It works as advertised

Paul Fedor - Reviewed in the United States on June 21, 2022

I have a big hex like pool shape with tons of steps. It climbs steps and waterline...and deep........I got it when it was $1500. Solid buy.........

2 stars
Worked great for one year then useless warranty claims

Steven Tebrich - Reviewed in the United States on June 29, 2022

Worked great for the first year. Yes it gets stuck on the drain but as long as I pushed it off once or twice a week it kept the pool clean. Went to put it in the spring and it kept popping the GFI. No problem 3 year warranty right? After a week of very slow responses from the company they said they'd send me a new power supply (took about 2 minutes for me to figure out that's where the problem was). Here I am over a month later with a quarter of my swimming season gone and I have an extremely expensive paper weight because they claim the part is back ordered and can't tell me when I'll get the replacement. Unacceptable customer service not that they probably care. I'll be buying the competition and just chalk this one up to an L.

2 stars
Stuck on stairs

Kindle Customer - Reviewed in the United States on August 28, 2022

I waited a while before I put in this review. The vacuum is a good vacuum. BUTTTTTT it constantly gets stuck on my pool stairs therefore the cleaning stops. If you are not there to pull it off the stairs no cleaning gets done. This is constant every day. I think my old vacuum did a better job of scrubbing. For the amount of money I paid, I think they should put the technology that helps the vacuum maneuver stairs and do its job.

5 stars
Best robot cleaner we have ever had

KDV - Reviewed in the United States on May 14, 2022

This machine does a super job cleaning the pool, and is quiet. It is exceptionally easy to clean. It has a nice long cord which is bigger and more durable than others we have had. Strongly recommend.

4 stars
Pretty good!

Amazon Customer - Reviewed in the United States on February 10, 2022

The system is phenomenal! The only issue I have is that it only has one cleaning mode. That’s it.

4 stars
Working well for the most part

Dzung Do - Reviewed in the United States on April 30, 2021

Contacted the Dolphin support on week 1, and it took them over two weeks to respond. This week, the robot lost connection to wifi and multiple attempts, everyday, trying to connect but not working. I disconnected the robot and use the QR code to pair a new one, but that didn't work. Right now, the only option I have is connecting through Bluetooth. Contacted support today. Will add to this review one I get reply back from support. Updated: Maytronic responded within 2 days and resolved my issue. Updated review from 3 to 4 star. Leaving one wishing star for the robot's ability to be able to clean just waterline. I think Maytronic can do this with some update because I can use my app to get the robot to the waterline manually.

5 stars
It works! It really works!

Michael Scholl - Reviewed in the United States on August 29, 2019

While this product by Dolphin, I feel that it's spirit animal is truly the stingray. It just acts more like a stingray than a dolphin. This has no bearing on it's performance, but speaks more to it's personality as a non-organic consciousness. I felt that may be important to some as chi in a pool can have a big impact on the ionization of the water and the life giving properties of the waters. I am ashamed to admit it, but there were things accumulating at the bottom of my pool. Not for days or weeks, or even months but years...sand or sand like particles that were too heavy for my pool vacuum to lift. I just came to believe that this gunk was going to live there until I took the time to dive down and sweep it up somehow...so it stayed. With the Sigma it was all gone in an afternoon. Yes I had to clean the filters multiple times that first day, yes I did cycle it through multiple cleaning cycles and yes I'm proud of my pool again. All with almost no effort on my part. This little stingray shows the power and value of just doing something repeatedly for a long time. The device is great, it comes with very limited manual and instruction...but really...just plug it in, drop it in the water and press the power button... I've only had it a couple days, but it has already made a big difference in my pool

5 stars
It works great!

Roger W. Lowe - Reviewed in the United States on April 25, 2019

The one I ordered from Amazon had a defect - its handle was detached. I called Maytronics customer support and they had a new one to me two days later. I then returned the defective one to them with free shipping. Their customer support was fantastic. I've had the new Dolphin Sigma for a week now and am very pleased with it. It does a fantastic job cleaning the pool bottom, sides, bench and tile above the water line. I still have to sweep the tanning ledge since the Sigma isn't supposed to be operated in less than 2 1/2 feet of water. I haven't had many leaves, but the few I had were picked up easily. There have been several bad reviews about the remote. I didn't get it because I have a smart phone and downloaded the Dolphin app. The app is limited but it does a good job maneuvering the Sigma in manual mode. I use it to move the Sigma onto a pool bench, then powering it off so I can easily remove it from the pool. I've had no problems connecting my iPhone via bluetooth to the power supply. Contrary to some other reviews, my Sigma has had no problems with my raised drains. It goes over them as if they weren't there. One thing I haven't seen in the other reviews is that the Sigma also works in a spa. It has no problems cleaning my unground spa, which I was unable to do with my other cleaner. I could not be more pleased with it. I bought the 3-yr extended warranty from Amazon and so am covered for 6 years.

2 stars
Get ready to be frustrated

Jay A. Johannigman - Reviewed in the United States on February 14, 2022

Finally broke down and bought a new pool cleaner. Did the research and read the reviews and settled on the Dolphin Sigma pool cleaner. Was able to set it up and turn it on----- but if you think that it is going to work via the app or the internet; forget about it....... I spent the next month trying to dig time out of my work day to call the support line and troubleshoot the entire system. First I am sent a new power supply and then spend another four hours because that doesn't fix the problem either. The solution-- you pack it all up; haul it all to the FEDEX store and pay for the two sets of boxes and packing to send it back for the interminable return process. The company stresses the customer experience-- this customer is not so happy. I am now in my fifth week without a functioning pool cleaner. I promise to update this review if by some miracle I get a new unit in a reasonably short period of time and it works with the app and my internet. By the way-- read the fineprint-- the system only works on 2.4 GHz internet systems; not the faster 5G systems

5 stars
59 percent cheaper to run , 50 percent easier to clean

lou - Reviewed in the United States on January 29, 2022

Had trouble getting blue tooth to talk , finally got that , which gives you the ability to drive it , wifi neaver happen , with that said does clean the pool yes ,do you need blue tooth or wifi no , push the on button and away it goes , the last one I had for 15 years still works , cable broke ,and is stuck , maybe some day I will get around to it

5 stars
Great for Autonomous Cleaning - well Engineered and well Built

Amazon Customer - Reviewed in the United States on May 27, 2019

I have a screened-in lanai, so I get mostly small bits of debris, much of it floating. (I use a floating autonomous cleaner for fine surface stuff.) This is a saltwater pool using an external DE filter. When refilling the large DE filter, a lot escapes the system - the Sigma is great at removing it. Even though I have a new filter, there is still a fair amount of stuff picked up by Sigma weekly (maybe 1/4" layer at the bottom of the Sigma screens.) Cleaning Sigma's top-loading filters is very easy - very well engineered. It does a good job in cleaning my pool (about 12,000 gals.) I run it about 2x a week. It climbs right up to the waterline - incredible. I've had Sigma for about 2 months now, my first submersible cleaner. Came without a caddy, which was purchased on the same order - a recommended tool. The remote control (Bluethooth to iPad Air2) works, but the response time is about 2 seconds. As an RC pilot, I find this to be incredibly slow - but the Sigma is not going to fly off! I have toyed with the Remote, but not something I use normally. My only wish is that it should have a built-in video camera - LOL. I've filmed it with some actions cams under water - interesting. According to the box, this is made in Israel. A very good product, including the power supply and cable.

1 star
Stuck on drain and no support when I called

Reajuan Parker - Reviewed in the United States on January 4, 2022

This unit constantly gets stuck on my two drains. I can't walk away and let it clean because when I come back it is stuck and who knows for how long. I am extremely disappointed. When I called they offered me three solutions. The option were 1) remove the filters from the unit and it won't get stuck anymore. If I remove the filters then how is my pool getting clean? 2). Adjust the handle on the unit. I tried all three positions and none worked. 3) Purchase something to install on the drains. When I researched that option people said they don't last or work. So we drained the pool and added PVC pipe on top of the drains hoping the unit would just bump them and move on. But no- they crawl right up there and get stuck and as you can see I have TWO drains so this unit is an endless nightmare. I can't walk away while it cleans my pool because within 10 minutes it is stuck again so I have to tie off the cord (see picture) so that the unit can't reach the deep end of my pool where the drains are so that it can clean at least part of the pool without me constantly watching it. I really HATE this thing. I am so extremely disappointed and will never buy from this company again. Some people commented that the company fixed theirs by installing a brush on the middle of the unit which prevented it from getting stuck. They have not offered me that solution. I would even be happy if they would SEND ME the stuff to fix it. I assure you my husband could do it no problem. They just don't seem to care. I should add that they did replace my power supply when it quit working. I appreciated that but I sure wish I could walk away and have a clean pool instead of finding out it has been stuck for an hour running my electricity bill up. So frustrating!

5 stars
Love this bot!

penny english - Reviewed in the United States on April 18, 2022

Really needed while on travel. Works really well. Only gets stuck on main drain if the pool pump/suction is on. Run at night while pool is off and never had problem again.

3 stars
Good pool cleaner, but not as impressed as thought I would be

Guoster's Mom - Reviewed in the United States on July 1, 2018

We inherited a Polaris pressure cleaner with our pool when we moved into our house a couple of years ago. The Polaris cleaner did a decent job, but it was rather dated, and had have a couple of cons that were rather annoying. One was that it always seemed to get stuck on our ladder in the deep end (despite putting the guards in that side of the ladder). This meant that we had to manual extract it from this location several times during the course of a cleaning. Two, it always missed several spots that we either ignored, more manually vacuumed when the cycle completed. To make life easier, we decided to splurge on the Dolphin Sigma, which seemed to have a lot of modern bells and whistles. I have to admit, it does a better job than the pressure vacuum in less time while using less energy. However, we still have the same two issues as before. Now, instead of the ladder, it gets stuck several times a cycle on the drain cap on the bottom of the shallow end which requires manual extraction (picture). This means that we can't really run it when we aren't home, and can't use any of the auto features. Like the pressure vacuum, it also misses several locations during a cleaning cycle. The remote control feature seems like it should be a solution to this issue, but we haven't been able to actually make that work yet. I would give it five stars if it hit all spots and didn't get repeatedly get stuck on a standard drain cap on the bottom, so I removed a star for each of these two reasons....which was why we decided to explore such an expensive option in the first place.

5 stars
Finally a crystal clear pool

Eve - Reviewed in the United States on July 20, 2020

I have been running this machine every day for a week. After the 2 runs, the pool was crystal clear. It picked up tiny needles from a row of cedar trees and plenty of sand on the bottom of the pool. I am very impressed and wish I bought it many years ago. No tangling yet. Since I put it in the middle of the pool, it only used half of the cable. It cleans the waterline and steps but it as good as the pool floor. Like other reviews, when you lift up the vacuum off the water, debris will drop back in the water. The app needs a major improvement. I like the top filter cartridges loading, so I don't have to do more lifting and scratch the side of the machine on the concrete floor. Overall, I love this machine and definitely and big improvement from the traditional pump vacuum. If you ignore the app, it is on par with my Roomba!

5 stars
Love it

T - Reviewed in the United States on June 21, 2022

Love it

5 stars
It actually works well!

J. Comeaux - Reviewed in the United States on April 26, 2022

The unit works great and well worth the price. Unfortunately, the app is horrible. I keep getting unit is not connected despite it actually working and cleaning my pool.

5 stars
WOW!!!

kathy lynne - Reviewed in the United States on May 21, 2019

My husband always took care of our very large pool. Recently he had a heart attack which caused a lung condition to come out of remission and go crazy. He is now on a lung transplant list. Needless to say we had to hire someone, move, or I had to find a way to handle the task that took him hours every day. I found that technology had come to my rescue. I ordered the Dolphin Sigma because it seemed the easiest to handle and the technology was the latest. It is awesome!! I put it in the pool, plug in the unit, and push the on button. End of story. I had just replastered the pool and this picked up all the tiny specks of plaster dust, leaves, twigs, and dirt. By the time a two hour cycle is done, the pool is spotless and sparkling. I then lift the sigma out of the pool, drain off the water, unplug the unit, and set it on the dolly. Then I pop up the cartridge cleaners and hose them clean- 3 minutes tops, and put them back in. No more hoses and vacuums in the pool all day. My grandchildren can swim in a clean pool with nothing in their way. I feel very blessed and thankful that this machine has helped us stay in our home. One headache and chore done! Thank you Dolphin Sigman 2019!! Kathy

5 stars
Oh yes the best thing in my life right now

Davon M. Young - Reviewed in the United States on May 19, 2022

You need this if you have a pool with that gets debris

5 stars
Sigma works great.

Kim Sikora - Reviewed in the United States on April 30, 2021

The media could not be loaded. The Sigma has worked great. I have a gunite pool with pebble tech finish. No issue with my drains or climbing walls. You need to index the handle at a diagonal. I put mine on opposite corners. I was worried about all of the comments on the unit getting hung up on the drains but it’s not an issue with my pool. I also have a tanning deck that is 14” deep and about 12’ x 7’. It climbs up there also and scrubs away. I used it daily for 2 weeks and it got better as time went finding these areas. The app works good. Manual drive is a little lagging and can be difficult, but it’s not that big of a deal.

4 stars
Great product with a few exceptions.

Michael K. - Reviewed in the United States on May 14, 2021

PROS Cleaned a medium sized black bag full of leaves out of my pool in no time at all, much better than my polaris. It also cleaned the surface of my pool shiny new, my polaris couldn't even come close. CONS Doesn't climb the walls like my polaris. Definitely doesn't do stairs or ledges. Requires strong wifi signal to maintain connection for remote control (this is a common problem) Result - I sweep the walls, stairs and ledges, Dolphin does the rest.

5 stars
It has never got stuck on the steps or ledge

Amazon Customer - Reviewed in the United States on April 20, 2022

I have a ledge all around my pool and other ones always got stuck. This is the one to buy

5 stars
Saved me so much time and energy! Love it!

JST4 - Reviewed in the United States on August 20, 2020

I bought this Dolphin Sigma Pool Cleaner in July 2019 after my husband died and I had to learn how to take care of our inground pool from scratch. He did everything with the pool before and I have to admit all these new steps monitoring and cleaning it was getting the better of me especially with the brushing and trying to manually vacuum through the skimmer. Then I bought the sigma and the weight was lifted off my shoulders, the difference over night was unbelievable. The pool always looks clean and cleaning the filters is a breeze. Just dump the debris in a plastic bag from the Super market and rinse the filters with a hose...done deal. I still am clueless on testing the water with the chemical kit, so I just take it to the pool store to analyze. But love, love my Dolphin Signa ❤️

3 stars
Gets Stuck on the Main Drains

DH - Reviewed in the United States on March 21, 2022

Great product, however it doesn't get itself unstuck from the drain, therefore I need to manually adjust when it gets stuck. Not ideal. Needs a middle wheel to keep in moving.

5 stars
Do yourself a huge favor and buy it

serineh harounian - Reviewed in the United States on May 4, 2022

Worth its weight in gold. Saves me so much time. Love it.

5 stars
Best pool cleaner on the planet

Amazon Customer - Reviewed in the United States on April 17, 2022

After owning 2- Hayward pool cleaners, I gave up on them. They broke down often.

5 stars
Simply awesome

zedd - Reviewed in the United States on January 28, 2019

We live in an area with a very heavy bio-loading on our pool (Savannah). We have multiple large oak trees among other species that make a mess of our pool on a regular basis. Prior to ordering the Sigma, we had the typical jet pump-powered pool cleaner on a daily timer. The bag was always filling up pretty quick and the tracks were starting to wear so the motion was erratic. We contemplated getting a newer model but I found this Sigma on line and ordered it. I'm glad I did! No more random tail whips of water from the cleaner and it has done a great job. I'd say the two filters are each about the volume of the prior pump filter bag, so we get double the volume of debris before cleaning. More importantly, this unit has be run daily for almost 9 months while providing us with a cleaner pool. I will say that just recently the bluetooth capability has stopped working but the Sigma keeps working just fine. I don't need the bluetooth capability and never really used the virtual joystick to move it around. I just let it do it's thing.

5 stars
Best robot for the money

Tom - Reviewed in the United States on December 8, 2021

I've read reviews, did research and finally bought. So happy I did. This robot for the money is so worth it. It does a real good job, it doesn't take a long time for it to clean, its powerful, its easy to clean up. I don't think you possibly can get any better.

5 stars
Solid Product

ctrmpoet - Reviewed in the United States on July 8, 2020

We’ve had the Sigma for about a week, and we’re very pleased. Our pool had been immune to the cleaning efforts of traditional cleaners, so the Sigma’s solid performance is a great relief. I really dig that the dirt is captured so I can remove it (cleaning the machine is done in an easy 5 minutes), instead of going into the pool’s filter which triggers expensive maintenance. Heads-up on the big picture, though: 1. It does’t do much with the steps. I sweep those before starting the Sigma now. 2. The QuickStart guide is so bad that no guide would be better. Really. 3. I setup the app, but I don’t use it. I just put the Sigma in the water, then hit the big button on the power box. That’s it. The app doesn’t make doing that any easier than it already is.

2 stars
WiFi loses connection every few days.

JOSEPH B HOCKER - Reviewed in the United States on August 30, 2022

Loses WiFi connection every few days. Unplug, power on, WiFi is back, but need to set schedule all over. Every few days!!!! :(

4 stars
Great product!

billyd - Reviewed in the United States on July 6, 2020

I have owned the Sigma Dolphin for a year and a half and it has worked well. I would like to give the product 5 stars but I have one annoying issue; it constantly gets stuck on my floor drains and I have to pull the cord a little to keep it moving. It may be that my drains are higher than other pool owners but, obviously, I can't do anything about that issue. Otherwise, the robot works flawlessly and I have already paid for it by not hiring a pool cleaning company. It's a great vacuum cleaner for your pool.

1 star
Misleading description on the AppStore

DoNotContact4Review - Reviewed in the United States on September 22, 2022

You’re better off buying cheaper models and save over $500 because they are misleading you on the features. The AppStore shows several cleaning mode however, after I bought this $1700 dolphin sigma and downloaded the app, I discovered that it doesn’t offer different cleaning modes. Mine gets stuck on stair all the time. I contacted customer services several times and here’s their answer: “ These cleaning modes are available on other, higher-class models, such as the Nautilus CC Supreme, M600, and Explorer E70. The Dolphin Sigma comes with the basic app, which includes one automatic cleaning mode, the weekly timer, and a manual drive.” Do your research before buying this brand and model. It’s not worth $1,700”.

5 stars
Great Cleaning Easy to Clean Filter

Luke Selking - Reviewed in the United States on September 27, 2020

On my 3rd season and I am very pleased with this robot! Unit cleans much better than any unit before. I can clean it quickly and no longer dread cleaning out the filters. Motors are powerful compared to previous units. Don’t regret spending the extra money on this unit. Below is when I originally reviewed this item. Had this for 1/2 of the season. This is my third unit from this company over the past 10 years. Best by far. Does much better job of getting all parts of the pool. Not as good for big leaves. Easy to clean out when full. Also love the fact that it will run each day automatically! More powerful than past units.

5 stars
It works great and saves me time!

Paula Correa - Reviewed in the United States on March 1, 2022

Best Buy Of 2022 so far! It has great suction, easy to clean, easy to program and it’s a mini cleaning assistant that saves me time.

1 star
DO NOT BUY

Eric Labaska - Reviewed in the United States on August 5, 2022

Purchased this unit paying close to $2,000. Worked for less than 60 days and then stopped DEAD. Retailer refused to help stating to go use manufacturer warranty. Manufacturer refused to replace unit. Making me ship back to them to repair and that they would ship back. This is going to take over a month to resolve. Living in the Northeast, pool season is just about 2 months long. With it being early August, I will no longer have a pool cleaner for the last 4 weeks of the season - that’s going to be half the season!! They did not care. I appealed to Management but nothing. This product is not dependable and for being the highest-end product offered, I should not be dealing with this! $2,000 paid and now no cleaner for the 2nd half of the season. NOT RELIABLE AND MANUFACTURER JUST SIMPLY DOESN'T CARE. It’s now a $2,000 pile of cheap plastic!

5 stars
Absolute Beast!!!

jay minassian - Reviewed in the United States on May 14, 2020

The media could not be loaded. I have been researching for over 6 months for a robot and going back and forth. We just had our pool installed and with that came tons of dirt, sand and rocks. We purchased the sigma after reading some great reviews and some not so great reviews but thought with the newest technology and suction power it must be the best. Well I can only say it lives up to its technology. The sigma is a workhorse. Right out of the box I had it cleaning the pool and picking up all the sand that was from the pool install. You won’t be disappointed. It climbs the walls and as with any robot it will have issues climbing all your stairs. The sigma will climb 2-3 stairs then come back down. Love this purchase.

5 stars
Great Pool Cleaner Why did i wait so long to get it...

Mike - Reviewed in the United States on March 9, 2022

so far so good cleans pool great and scrubs the water line great great investment.

4 stars
Very Happy with this Pool Bot Cleaner.

Dianhkg - Reviewed in the United States on August 12, 2020

Excellent cleaner and has never "turtled" once in first 3 weeks. Gave it 4 vs 5 stars due to it getting stuck on my pool drain covers about 30% of the time. I have usd the phone app and can maneuver it no problem but when stuck on drain cover, I have to pull it off manually. I like that I can schedule it daily to clean. Basket is huge and I clean only weekly, more if windy. My pool has never looked so good!

1 star
$1500. Down The Drain.

Bill Roberts - Reviewed in the United States on September 5, 2022

This machine just mixes everything into a cloudy mess, yes I have tried both filters It does not make it past 15 minutes with out getting stuck on my floor drain, so I guess my floor drain is as clean as they come. Since it gets stuck after 15 minutes, about 10% of my pool gets clean, not so energy efficient for a 2.5 hour cleaning. I have a Grecian style pool that has defined straight lines on the bottom, can not clean the sharp edges of this style of pool. I would have never purchased this product if I knew these things about the "cleaner"

4 stars
Great cleaner.

Builder2961 - Reviewed in the United States on July 11, 2019

This is by far the best pool cleaner I have ever owned. It scans and cleans the entire pool including stairs, swim up seat and waterline. Simply amazing. The cartridge filters get the smallest contaminates and the mesh filters are great for doing and fall cleaning. It’s powerful and smart. I would have given it five stars, however the Bluetooth control is really lacking. It doesn’t allow you to really do anything no robot information and pretty much impossible to navigate. I really wish it was more like the interface that my rumba has. Also, every once in a while it gets hung up on the floor drains. But if you Are looking for a great cleaner this is for you.

5 stars
Works great

Lorraine L. - Reviewed in the United States on July 26, 2020

So far so good, cleans my pool better than I could do it myself, easy to use cleans the steps and walls all the way up to water line. Nice filters that are very easy to pull out and clean. It is a bit heavy to pull out of the water. I bought the caddy, came apart after first use, it seems too heavy for the cart to manage, I will put cart back together and try again. As with all these mechanical things let's see how long it lasts, my last Hayward small pool cleaner lasted almost 20 years,it attached to the suction of the intake, this is so much easier.

3 stars
Dont Buy

Pat Sherer - Reviewed in the United States on September 13, 2020

I have had my Dolphin for 5 months and the brushes have come off 3 times now and the belt around the brushes has come off at least 4-5 times. Other than that it is the best pool cleaner I have owned. Pool was cleaner after the 1st use that it has ever been. If I can just get the brushes and pully on, it would be a 5 star rating. Have not used the remote control feature. BEWARE: I had to take the cleaner to have it repaired as the tracks kept coming off. They part was covered by Maytronics but not the service charge since I bought it from AMAZON. The problem was there were a lot of leaves inside the machine (which you have to take apart to see). My service call is $ 95.00

5 stars
Money well spent

Thomas M. - Reviewed in the United States on July 11, 2019

I know $1500 is a lot of money for a pool robot, but after the first use I had no regrets spending that much. I use the bigger filters in it since my dogs swim with us. I think the micro filters would clog with dog hair with them installed. This thing even sucks all the hair off the drain cover while the filter is still on! I have a 32,000 gallon liner pool and it does a fantastic job. It has never got stuck and even does a ok job on the steps. I find that brushing the steps before I start it works best. Cleaning the filters is super easy and for how big it is, it’s pretty easy to take out of the pool when it’s finished. I haven’t used the Bluetooth remote yet, as it has mapped the pool out on it’s own. Great purchase.

1 star
Great…..when it was working

Shane Smith - Reviewed in the United States on August 4, 2022

This robot was working like a champ. I ordered it on May 3 but had to send it back in July. I was told it would take 10 days to repair. I still don’t have it back and it’s been two weeks already. I reached out to customer service. I don’t think I can take another apology. I asked him to replace the unit rather than wait on whatever parts they’re waiting for considering how new the unit is. While the unit worked fine, their customer service is not on par with what Amazon produces. I think I paid way too much for this unit to not be able to use it during the summer months when I need it most.

4 stars
Mostly excellent

HED - Reviewed in the United States on September 1, 2020

I wish that it was programmable so that I could get it to clean the areas that actually need cleaning the most. Seems to spend quite a lot of time circling the deep end and getting "stuck" on the main drain even when the suction to the main drain is moved to the skimmer. Would love to be able to develop a chosen path!!!

4 stars
Unable to connect blutooth/home router

Dean Y. Watanabe - Reviewed in the United States on March 30, 2021

The app wants us to buy an extender. The power supply is within 12 feet of the home router and cell phone. Everything should be close enough. Have not been able to spent the time for troubleshooting yet.

1 star
Wow.. horrible design

Mitch - Reviewed in the United States on May 1, 2022

Ok first, i applaud Dolphin for hiring a complete team of last in their class engineers, they have to eat too. Although it does make for a horrible product. They put a flat bottom on this thing which gets high centered on the bottom drains. If that wasnt bad enough, this thing is a drain cover seeking missle. It goes straight for the drains everytime, no matter how manny time you pull it off. We do have some of the cleanest drains on the block though. But luckily, when you contact Dolphin about this issue, they do act like it's your fault, you are to blame and should be ashamed, instead of trying to remedy the problem. Everyone loves to be talked down to, really brightens your day. They will tell you "don't run the pool filter at the same time". (Doesn't make a difference). Anyway, id look for another brand, unless you are having an issue with dirty drains, then this puppy is for you.

5 stars
Wish we would if bought sooner

Ddf - Reviewed in the United States on July 26, 2021

Used our neighbors once, did such a great job, bought one for our pool. Our neighbors trees make our pool a 3 hr cleaning just to use. This has saved our time and frustration. Glad I researched several models and brands versus buying for just price. Well worth the money!

5 stars
The best out there hands down

Bowhntr - Reviewed in the United States on June 29, 2018

Have only had it for a month but it does a fantastic job. Had a polaris 9450 that was ok if the POS motor would last more than 3 years. This Dolphin Sigma really does a good job scrubbing the walls of the pool. I have not had to brush the walls in 4 weeks. The 3 motors shoots the water out the top vs behind the unit like all the other brands do which stirs up debris that never gets vacuumed. My Polaris was in the pool every day having to clean,,, the Dolphin every 3 or 4 days because it does such a good job. I’ll never regret paying what I paid because of the time it gave me back for myself. My pool is 32,000 gallons and it does the job in about 2 hours. So worth it, but my only complaint is you spend $1,300 bucks and you’d think the dang caddy would come with it but that’s another $130. Please !

4 stars
Back saver

Greg Schmidt - Reviewed in the United States on April 27, 2021

Great little Robot, it's saved my back, and hours of hard weekend work. Check out my full review on YouTube, channel name is Fix My Bleep!

3 stars
Not worth the extra money for the app

Vinnie S. - Reviewed in the United States on June 3, 2021

The vacuum itself is good. I just wish I didn't spend the extra money for the app. The remote driving has a 2-3 second delay on input. The only thing I've found the app useful for is tracking the progress of cleaning which is honestly useless in itself. Beyond that the app offers no useful features unless you plan to leave the robot in the pool 24/7 in which case you could schedule cleaning but it's not recommended to leave in the pool all the time.

3 stars
Was hoping for a better product

A.G. - Reviewed in the United States on April 26, 2021

It cleans our 40 ft pool well, but does not get the corners, stairs, and tanning ledge. Every time I set it on the tanning ledge, it just drives down the edge immediately into the rest of the pool. It seems to work better for a rectangular pool, but not as well with rounded edges (like ours). Also, the Bluetooth will not connect after multiple attempts. Not sure that feature is worth the extra money. For the price of this pool vacuum, I was hoping for a little more.

4 stars
Robot gets stuck on the drain/ bit now a fix that seems to be working.

John g gordon - Reviewed in the United States on June 20, 2019

lVery unhappy. Robot gets stuck on the drain, and I’m t old I should use he Bluetooth and navigate it around. I have tried everything the manufacturer suggested, but nothing works. This is a top of the line model, quite expensive, and it just doesn’t do the job. Post script/. After communicating numerous times with the. Company, I adjusted the handles completely forward. The problem seems to be abated. Try this if you are having problems. Post script two- problem is back. Not sure there is a solution here

5 stars
My new pool man is fab!

Susan Silberman - Reviewed in the United States on December 25, 2020

It does a great job cleaning even w/solor cover on it still cleans the rim of pool. Im leaving it in pool full time because its heavy & im a senior. Will probably fade color but oh well. With cover & screened pool i find it inly needs cleaning once a week. I swim every day, so cover is removed then Very happy so far. Only have it 1 month

5 stars
A must have ! For us anyway!

TERESA T. - Reviewed in the United States on July 21, 2021

Best pool accessory purchase. Works great on our 16x33 above ground pool. Now if it could just skim the top of the pool then we wouldn't have to use the extension pole. Corners are a little tricky for it but it really gets above the water line really well.

5 stars
Works great

Amazon Customer - Reviewed in the United States on March 5, 2022

Works great

5 stars
Great vacuum

MilFiction - Reviewed in the United States on December 15, 2019

I've had this unit for almost one year and continue to be very satisfied. Outstanding suction that picks up all dirt, sand, grit, hair and the usual leaf debris. Cleaning is easy and the "five day cycle" does a phenomenal job keeping my inground pool clean. Cleans the walls up to the water level and a touch above. Cleans stairs. In one year it has thrown a track twice; this condition was easily fixed. The unit has never been stuck on my bottom drain or anything else. The Bluetooth phone app is useless and after one use I forgot all about it. Honestly, it's not at all necessary.

5 stars
Second to none

pablo - Reviewed in the United States on January 3, 2022

No otger robot can clean walls an waterline like this one. Period

4 stars
Pool Step Cleaning - NOT

luis c. - Reviewed in the United States on February 27, 2020

Robot works well, and has some good suction. However, at this price level i was expecting better performance. Robot does not clean steps at all. it does not climb the pool steps, nor doe sit climb and clean an long underwater bench we have. I replaced my other pool robot for this one, at 2x the price, expecting it to be "it"! It isn't. Disappointed!

2 stars
Atascado

Cliente - Reviewed in the United States 🇺🇸 on April 14, 2022

The media could not be loaded. Se pasa el día durmiendo de bago siempre para hay a dormir solo trabajo con tremenda fuerza el primer día pasaba por derriba del desagüe como si estuviera en una pista de carrera no lo a vuelto hacer mas esta muy bagó

5 stars
My Fresh and so Clean Clean Pool

Leslie H - Reviewed in the United States 🇺🇸 on July 12, 2018

My pool is very close to my neighbor's beautiful HUGE pine tree. I have a never ending issue with debris from the tree...pollen, bark, needles, and bits of cones. Also I have a "Grand-Dog" (Labrador) who swims often and sheds constantly. The Letro Legend that came with the pool tried but was never successful at thoroughly cleaning the bottom. The Dolphin Sigma is amazing! This 12 year old pool has never been so clean. To say I love it may be an understatement. I take videos of it to show friends, yeah, OK that may be a little weird...The first couple of times we ran the Sigma Robotic Cleaner the filters were filled with huge amounts of sludgy goop all that stuff was in my pool...ICK. Now the filters have a more normal amount of debris. Seriously crystal clear and clean water, I am so happy!

4 stars
Good but doesn’t have a good brushing action

Octavian Tetelbaum - Reviewed in the United States 🇺🇸 on August 12, 2019

Seems to be working properly. I wished the brushes would move at a higher speed than the wheels for a proper brush. Can’t say it does the walls very well and it does get stuck in the water outlets or anything that protrudes on the walls. Doesn’t climb curved stairs. The remote app works only if you are really close to the power source. The delivery was fast On the robot but took a week longer for the caddy

5 stars
Worth The Money

J.R. - Reviewed in the United States 🇺🇸 on July 3, 2020

I recently bought the Dolphin Sigma after returning the Dolphin Nautilus CC Plus vacuum. While the sigma was a higher cost, you get what you pay for as the cleaning power of the Sigma surpassed the Nautilus CC Plus. I am happy with the purchase. I have not tried to remote function yet as I hadn't needed to as the Sigma cleans the pool very well. I have an irregular vinyl lined inground pool.

5 stars
Great product!

Hugh Mcgillivray - Reviewed in the United States 🇺🇸 on December 26, 2020

This machine is amazing. Better than the reviews said. It climbs the walls & scrubs above waterline. Climbs & cleans steps & the Baja shelf. Only con is we have self cleaning pool & it hangs up on the pop ups and knocks 1 track off. I just shut auto cleaner off while using this tool. We love it.

5 stars
Fantastic pool cleaner

Emma - Reviewed in the United States 🇺🇸 on June 23, 2019

This pool cleaner is amazing. I initially bought the Triton PS plus which did not clean well at all and returned it within a week. This cleaner does a fantastic job and gets all corners and steps. It is a bid heavy to lift out but not terrible. Tou kist need to let the water drain out first. The filters are easy to clean and put back together. The wire swivel works perfectly and prevents any tangles. Although expensive, this cleaner is well worth the money. Update: Using it for the second season. Still works great. Cleans very corner of the pool. Can't comment on the remote function since I never need to use it!

2 stars
Remote control spotty and gets stuck often

Todd D. Varner - Reviewed in the United States 🇺🇸 on April 16, 2022

This robot is not as good as the previous version that worked well. This one is supposed to be remotely controlled but that seldom works and the robot gets stuck on the bottom returns and corners where the older one didn’t.

5 stars
Great job cleaning Tile under Coping

Amazon Customer - Reviewed in the United States 🇺🇸 on June 9, 2021

Cleaning home pool 15' X 30'. At first, I was disappointed cleaning the filters. The cleaner left a lot of debris on the surface Then I learned to allow the cleaner to remain in the pool for several minutes before removing.

5 stars
I would recommend - for ease of use and effective cleaning

Tony Q - Reviewed in the United States 🇺🇸 on July 22, 2020

Does a good job cleaning the pool picks up fine debris and climbs walls and scrubs tile on top of gunite - Very Easy to use , clean and store Gets hung up on bottom drain sometimes but my drain is concave not flat and it doesn’t get the steps but this was mentioned , the caddy needs a higher rail and more depth to keep line from falling off

3 stars
Durability issues

PKj - Reviewed in the United States 🇺🇸 on August 20, 2021

Convenient. Works well except for fines. However, one of the spongy wheels came off and the others do not look so hot. Not sure if this will effect performance or not.

2 stars
I was expecting more from a $1700 pool cleaner.

Miguel R. - Reviewed in the United States on April 25, 2022

Not bad but my previous vacuum a Hayward Sharkvac that cost $500 did a much better job with mapping and cleaning the pool. Don’t spent your money on it, buy something else.

3 stars
Gets stuck on pool floor vent & poor customer support

ML - Reviewed in the United States on October 30, 2020

When this pool robot works, it works very well. Unfortunately, it gets stuck on our pool floor vent so cannot be left completely unsupervised. When my husband called customer support, they didn't want to hear about it and were not in the slightest bit helpful. Not sure if we would've had the same problem with other brands but we're now left to our own devices to try and solve this problem. We do think this will be an excellent product once we fix this vent issue.

5 stars
This thing totally sucks... dirt!!

Brian White - Reviewed in the United States on August 10, 2020

Wow! I've never had a pool vacuum that works as good at this beast! It does an amazing job of not only the floors, but the walls of the pool! It will literally hang out on the tiles and scrub away! It's almost as if it wants to climb out of the pool to clean the rest of the patio! This unit absolutely rocks!

1 star
I'm not sure it has any warranty, there's no way to reach them

Becca.b - Reviewed in the United States on June 27, 2022

We purchased the product 2 years ago and it works great except the cable between the unit and controller is dissolving into the pool. I need a replacement but they talk about warranty support but there's no way to reach it through Sigma, they bounce you to their new online dealers but I bought it on Amazon. If I push hard and put the time and effort in I might get support but for this kind of money its too bad it appears the warranty is a scam.

5 stars
I’m liking this thing

enjoying each day - Reviewed in the United States on August 3, 2021

Been cleaning the pool by hand for 25 years having not seen a cleaner I wanted But this was worth waiting for Very happy with it Hope it lasts

5 stars
Excellent

glv - Reviewed in the United States on June 19, 2021

Works perfect, so glad I made this purchase. Picks up debris, the small pinecones from Redwood trees, sand and dirt. I’m sire if you take care of this cleaner it will last for many years.

5 stars
2 months in and loving it 2years and still loving it.

Dan - Reviewed in the United States on September 15, 2018

2 months in and loving the clean pool. Bluetooth is fun once or twice but really is not responsive enough. Put it in auto mode and you will be a happy camper, just do not forget to empty it because it really does clean the pool better than you think it will. Update 2 years. Small issue handles expertly by warranty. They received my unit Wednesday, shipped it back our repaired on Thursday, yes one day turn around. Replaced warranty item and even tracks which is debatable if it should be a warranty item, but charged me NOTHING. Amazing unit that is a workhorse. Wouldn’t ever buy any other brand.

5 stars
Very nice pool cleaner

Mike K - Reviewed in the United States on January 23, 2021

I've had this cleaner for about a year and a half now, and it's been great. It handles leaves and debris, it doesn't get stuck, and it's easy to clean/empty. For me, it was worth the cost. The bluetooth app is useless though

2 stars
Good vacuum, unless you have a bottom drain…

Mark - Reviewed in the United States on July 15, 2021

When it is working, it is an excellent vacuum, and worth the money. The problem I have with this vacuum is that if you have a bottom drain, it will get stuck every time. The cost of this product does not buy you a robot that is smart enough to know when it is stuck, much less inform you via the app that it is. I reached out to the company about this issue, and the remedy is to send the robot in to have a third brush added…. Otherwise, it’s a good vacuum, but it will spend an entire cleaning cycle (in my case 2.5 hrs) stuck on the bottom drain… so you have to babysit it.

5 stars
High Quality and Worth the Money

Kenneth Michael Bounds - Reviewed in the United States on May 4, 2021

Do not be afraid to spend the money to buy this pool cleaner! It is worth every penny! In fact, I just pulled it out of the pool after another successful cleaning. It is high quality!

5 stars
Best robotic pool cleaner

SRH I. - Reviewed in the United States 🇺🇸 on July 17, 2021

My pool is the cleanest it has ever been. We get a lot of leaves and dust blowing here and a daily cycle of 2.5 hours leaves everything sparkling.

2 stars
Not Worth the Cost

Amazon Customer - Reviewed in the United States 🇺🇸 on September 2, 2021

If you have a pool drain that extends outward, this robot will constantly get stuck on the drain. I've had other maytronics robots and they never got stuck; however, this robot seems attracted to the drain whether the pool pump is on or off. The only mitigations are costly drain inserts or shipping the robot, at your cost, back to maytronics for modifications. This hassle and extra costs are not worth the high price. The remote cleaning access is nice and they've made it easier to remove and clean the filters but still not worth the high cost.

3 stars
if you have lots of leaves this cleaner is not for you

Amazon Customer - Reviewed in the United States 🇺🇸 on December 28, 2019

it is very excellent in cleaning sand, algae and fine particles. It climbs walls very well but as for leaves it is terrible. The bottom openings get clogged very easily. The cloth sleeves just above the openings get packed with leaves. It has to be taken out and cleaned frequently, which is a big hassle. Also, the space for the suctioned leaves inside the filter areas is quite small. This cleaner doesn't have a large bag for leaves. It looks like the engineers did not perfect this product yet. I had to return the cleaner and I am using my old Polaris

1 star
CUSTOMER SERVICE AND PRODUCT ARE NOT WORTH MONEY

Amazon Customer - Reviewed in the United States 🇺🇸 on May 27, 2022

The media could not be loaded. Since within a month of purchase, machine stopped climbing walls. I made a complaint and I received message that machine may not be climbing because of low temperature. For context, I live in South Florida and temperature is never too low. Since a month, machine has stopped moving too. I made a call and after 20 minutes wait was asked to refer to website. I did all troubleshoot and still nothing worked. Again they sent me copy paste of their troubleshoot page. COMPANY SERVICE IS HORRIBLE AND NOT WORTH THE MONEY WE PAID FOR THIS PRODUCT

1 star
Worked for 40 days

Gale Slocum - Reviewed in the United States 🇺🇸 on July 27, 2022

I liked this robot until it stopped working. Ten days after the return window. It is on its way back to the factory on my dime. The manual control needs some work and it should have come with a caddy.

5 stars
best on the market

The Family - Reviewed in the United States 🇺🇸 on April 24, 2021

this works perfectly. cleans my 50,000 gallon pebble finished pool better than the maintenance guys that i have come clean once a week. can’t think of a single issue with this unit.

2 stars
Cleans well but gets stuck power supply trips GFCI

Meghan - Reviewed in the United States 🇺🇸 on September 2, 2020

**Update to my review** Had this less than a year and the power supply won't work correctly and keeps tripping my GFCI. So....useless. Not even 12 months. I love this thing but sometimes hate it. It does a very good job cleaning the pool except when it gets stuck on the floor drain (which it does every time I use it). Frustrating when you go out after 2.5 hours and think your pool will be clean and it's been stuck on the drain the entire time. It also doesn't like steps. Fortunately I only have a few so it's not a big deal. Cleans the walls great just make sure you adjust it so it goes all the way up. Easy to clean. Overall happy with the purchase.

1 star
It worked for a while. Defective power supply?

John Treble - Reviewed in the United States 🇺🇸 on December 15, 2021

I am a retired electronics designer and have plenty of network setup experience. It's very fortunate that the Dolphin Sigma is such an excellent cleaning robot without the use of WiFi because I have tried over and over, contacted Technical Support, switched my router from dual band to single band (2.4GHz) and done everything Tech Support told me to do, but there is no joy in WiFi land for my Dolphin. I let it work using only Bluetooth. That lasted for a while. Now the app says the robot is not responding and unplugging the power supply from the electrical outlet is the only way to reset it. Even then, it only runs for a minute then shuts down. I am VERY UNHAPPY with my purchase. I will be contacting Maytronics to get a resolution for this. I hope they will swap out the power supply, as I see it as defective.

4 stars
Love this thing

MC Hammertime - Reviewed in the United States 🇺🇸 on July 14, 2018

Love this thing! Filters, brushes, cleans!! Would've given it 5 stars but: A lot of $ for limited software and programmability. it doesn't do steps well. It only climbs to the coping 25% during a 2.5hr cleaning cycle. Info says it learns pool. It seems to be random like polaris but much, much better job. Still love it and would buy it again 1 month into ownership.

1 star
Did not work out for our pool.

Chuck - Reviewed in the United States 🇺🇸 on July 19, 2019

We purchased this cleaner in late April to be ready for use when the swim season started in mid to late June. We shopped for Maytronics cleaners only because of proudly owning a Maytronics Supreme M4, in use for 6 years, with excellent performance. It has worked excellent, however showing its age and needing wear parts. This Sigma cleaner was put to use in late June and never did work well. It was always stuck on the drain, would never climb a wall, and would hardly ever go from the deep end to the shallow end without assistance. It was used in the pool for no more than 5 or 7 days, with us always finding the pool dirty the next day and it on the drain, or impaled on the stairs. I returned it after the 100% Amazon return date, but felt it was better to be out 20% than out 100%. The original M4 cleaner, we call 'Sparky', has had $300 of parts replaced and it works like new again. Our old Sparky climbs walls, stairs, and is never to be found stuck on the drain cover. The filter system in the Sigma unit is the same as Sparky, but without an active center 3rd brush. A costly lesson. Sigma is several steps down from what we have used for 6 years successfully. Sigma was the wrong system for our in-ground, 6 year old, plastered 35k gallon pool. Down the road some, I'll look at the M-600.

1 star
WARNING - Will kill your kids by electric shock and drowning

David M. - Reviewed in the United States 🇺🇸 on May 9, 2022

WARNING! - not safe for children. Cord severed itself in the water. I caught my 2yr old and 7yr old about to get into the water when I noticed the exposed wires floating in the middle of the pool with the robot at the bottom. Power was still on. This will kill your kids. I contacted Amazon support to warn them and have this product pulled off the store. It’s still here?!? I submitted video evidence which hasn’t been posted here either for some reason.

5 stars
This is the best cleaner that I had

Edward Sherman - Reviewed in the United States 🇺🇸 on June 12, 2018

This is the best cleaner that I had .Dolphin knocked it out of the park with this one .Going from and older Dolphin that was garbage to this is leaps and bounds.I had Polaris before no comparison to the Dolphin Sigma with two different filters you can pick up micro debris .I had some scale and algae heavy on the bottom of pool and up walls to the water line .The sigma cleaned it all up even the acorns and the big oak leaves got sucked up by the Sigma. This was well worth the money

5 stars
Snow is her name and she cleans GREAT!

James Delie - Reviewed in the United States 🇺🇸 on May 12, 2021

Absolutely great unit! Did my research! Do yours! 2.5 hour cleaning cycle takes care of my 20k gallon pool. Super easy to clean. I definitely recommend!

1 star
Missing the dock

Gavin Richardson - Reviewed in the United States 🇺🇸 on August 21, 2022

We got this expensive purchase and the charge dock wasn’t included. We now have the hassle of returning it

5 stars
Can't say enough about this vacuum

Justin H. - Reviewed in the United States 🇺🇸 on August 2, 2019

This has perhaps been the best pool-related purchase I've ever made. I've had no issues with tangled cords, it seems to pick up EVERYTHING and my pool has never been as clean. My pool is "free form" in design, so there are lots and lots of curves. Nonetheless, the Sigma has no issues climbing the walls and getting into hard to reach areas. Could not be happier.

5 stars
Read it’s the best and it sure is

JJD - Reviewed in the United States 🇺🇸 on April 8, 2020

Have to say this robot is a beast, I have a 40 by 23 foot pool and it cleans with ease, doesn’t get stuck on the drains, cleans steps, tile as well.... love this little guy, remote function is not that great but all and all worth every dollar!!

5 stars
AMAZING

Amazed - Reviewed in the United States 🇺🇸 on December 6, 2019

Absolutely amazing. Out of the box , remove packaging, plug it in, period. Large in ground pool with recent wind storm and pool loaded with leaves and debris. Frequent cleaning of cartridges required due to the shear volume of debris. Cleaning is super easy. If it last, will be WELL worth the price. Great job guys

5 stars
Awesome!

Daniel - Reviewed in the United States 🇺🇸 on July 29, 2021

Wow this is awesome, wished we purchased along time ago

5 stars
Great pool vacuum!

Cheryl A. Burgio - Reviewed in the United States 🇺🇸 on August 31, 2020

We really like how easy caring for the pool is now that we have the dolphin. The only problem we have encountered is every once in a while the vacuum gets caught on a drain.

1 star
Sad Performance

Rosebud - Reviewed in the United States 🇺🇸 on July 16, 2021

This thing is not worth the money. And I bought it last year when it was only $1,300. It randomly wanders around the pool with what seems to be no clear plan or program. I would have expected the Dolphin to map the pool and then clean the entire pool. It picks up everything it runs over. Unfortunately it does not cover the entire pool. There are some days it doesn’t clean the pool AT ALL because it’s stuck on the floor drain. I’m running it right now and I’ve already rescued the dolphin from the floor drain 6 times. And the remote control? The reaction is pretty bad and the Dolphin ends up spinning around. I’ve never been able to drive it over a specific spot. I’ll keep using it since I already wasted my money. But I’m not getting the performance I expected. Look elsewhere.

5 stars
Pool necessity

Raymond M. - Reviewed in the United States on August 10, 2020

Dolphin pool cleaners are truly one of the best. Use it 1 or 2 times a week and my pool always looks clean when its done. It's easy to use. Makes pool maintenance a breeze.

5 stars
Definitely the easiest best purchase I made for my new pool!

Amazon Customer - Reviewed in the United States on August 3, 2021

The media could not be loaded. Stop looking at other pool robots and buy this one already!

3 stars
Good but gets stuck often

Amazon Customer - Reviewed in the United States on May 9, 2021

Does a good job but first pool cleaner I’ve had that gets stuck on the floor drains.

1 star
Could not get anyone at customer service.

Jessica Johnson - Reviewed in the United States on July 9, 2020

Cleaner worked great for 1 week, then would power on but not clean, tried to start the cleaning mode through blue tooth feature or manually and it would not work. then I unplugged unit and let sit for over an hour then plugged back in and as soon as you turn it on it would turn itself off after 5 seconds. tried to contact help desk, was on hold over 20 minutes first call no one ever picked up, 25 minutes the next 4 times we tired to call sent several emails no response. called and selected commercial side and had someone on the phone within 5 minutes. I explained what happened and as soon as she found out I was residential she stated she could not help, but assured me she would have someone call me back.... never happened. had to send back the unit to Amazon. waited for two weeks to get a refund and when it was issued it was $277.99 short. I previously had a Dolphin pool cleaner before and had it over 5 years with no problems, very disappointed.

5 stars
This thing is a Rock Star

Ginny Jarvis - Reviewed in the United States on September 23, 2019

10 minute set up. Very powerful. It goes everywhere and collects everywhere. ( just like a Rock Star ). I have a 50ft pool. It stretches the cable out without tangles. Easy to clean. The pool is spotless in half the normal time. Very pleased with the product. It was expensive but worth every cent.

5 stars
My third Dolphin product...always excellent

Amazon Customer - Reviewed in the United States on October 28, 2020

This is my third pool cleaner by Dolphon and its just as great as they all were. High quality and superior performance. Truly amazing product.

5 stars
Great cleaner

Аmazon Customer - Reviewed in the United States on April 18, 2020

Great pool cleaner, works great. A little disappointed with the app to control it, not many options for setting timer and anything else. Other than that I would purchase it again. Directions not that good, YouTube videos are a lifesaver.

1 star
Don’t buy the sigma model for pool cleaner, it will get stuck on your drain

Margaret Pugh - Reviewed in the United States on July 17, 2021

I loved my last dolphin so I wanted to stick in the family. I loved the sleek design & the idea of the gyroscope? But, I sent a question in about this unit being stuck on drains & the response was that they have sold so many units & haven’t heard this. Well, this unit gets tuck on my drain ALL OF THE TIME! DO NOT PURCHASE THIS UNIT, THERE IS TOO BIG OF A GAP BETWEEN WHEELS & IT WILL DEFINITELY SPEND TOO MUCH TIME STUCK ON THE DRAIN. IT IS WAY TOO EXPENSIVE FOR AMPRODUCT LIKE THIS TO BE STUCK ON A DRAIN. terrible answer from Maytronics. I have had 2 other pool cleaners & they were phenomenal, this one isn’t even average. Do not buy the Sigma.

5 stars
Great quality

Shahram Shajari - Reviewed in the United States on July 11, 2021

Makes my life so much easier. Great product.

2 stars
Internet Buyers Don't Expect Any Support from Maytronics

Kenneth T. - Reviewed in the United States on June 17, 2020

I just received the new Sigma cleaner...opened box, no documentation..... I would appreciate help in posting a review. I did not see one on the website. I've been holding for 20 minutes without a person on the phone ( 1:30 pm CST 17 Jun 20): My comments would be: Paid $1399.00 but did not receive a rebate on the Dolphin Summer Sale as promised Received an OPENED BOX!! with partial documentation Robot works ok, without instructions it is HUGE disappointment and $1,399.00, Opened Box, No Documentation, No Support On the phone holding for 30 minutes, I would recommend looking hard at alternatives...

5 stars
Best for me

Karen D Macken-Goodman - Reviewed in the United States 🇺🇸 on June 21, 2019

I don’t use WiFi or auto anything. I manually put it in my pool 2 x a week. It works very well, in 2 hrs my pool is completely done. We have a large pool, it is under a screened enclosure so I done get leaves and sticks, but I do get worms, sand and mulch. Works great! Very impressed

1 star
Worst dolphin I’ve purchased.

Plastic doc - Reviewed in the United States 🇺🇸 on May 22, 2022

I’ve purchased three Dolphins and this one was most expensive and worst of all. It gets stuck on the Main drains all the time. I purchased clips, weighted baskets, etc with no success. It’s worthless. Sadly I can’t return it so it will sit in my basement collecti g dust.

5 stars
Easy to use, maintain and clean.

Michelle - Reviewed in the United States 🇺🇸 on August 8, 2021

Worth the money!!!!

5 stars
Worth the investment + awesome manufacture customer service

k miller - Reviewed in the United States 🇺🇸 on July 22, 2019

Had an issue with the power supply that came with it. Called the manufacturer directly and had a new one in a matter of days and now it's working perfectly. Well worth the investment. All I need now is the caddy, but I dont know which one as none of them say this model will fit.

1 star
a big design flaw problem track keeps falling off on one side

James - Reviewed in the United States 🇺🇸 on August 10, 2021

this has a design flaw that the belt that drives the wheels one side comes off all the time so I'm going to have to create a shield for it to stop this for the money you would think that they should've fixed the problem I have had this for 4 months and now the track that's on the wheels has come off 4 times I'm going to see what the company will do about that so, they have done nothing, and the outside plastic is starting to fade $1,300 plus I don't feel it's worth it I'm not happy I have to keep putting the belt back on all the time because the unit will stop working and customer service sucks

3 stars
Very heavy

Kirk - Reviewed in the United States 🇺🇸 on August 2, 2020

Very large and difficult to remove from pool. Previous CC Dolphin held more debris and cleaned the walls better. Remote is not WiFi connected you must be next to power box for a connection.

5 stars
Happy with purchase!

Tracy L. Murray - Reviewed in the United States 🇺🇸 on July 3, 2021

Great for sand in pool. Great product.

5 stars
my pool has never been so clean!

Robin Walesiewicz - Reviewed in the United States 🇺🇸 on May 14, 2020

Very easy to use. The filters are super simple to pull out and clean. My pool looked much cleaner after the first use. The app to run the manual operation is really fun.

5 stars
Does a thorough job on our 40’ in-ground pool.

Hoppy - Reviewed in the United States 🇺🇸 on August 4, 2021

No negatives

4 stars
Vent covers

christopher slaughter - Reviewed in the United States 🇺🇸 on November 17, 2019

It works great but gets stuck on the vent cover because it's not flat.

4 stars
Good cleaner

nikki ayoub - Reviewed in the United States 🇺🇸 on June 26, 2018

I give the cleaner 4 stars, works great and cleans really good. If has improved my pools appearance and my filter and pump work even better. The app is useless and I give it 1 star.

5 stars
Best Robotic pool cleaner on the market!

Gary P Affolter II - Reviewed in the United States 🇺🇸 on August 16, 2019

Best pool cleaner in the market and worth every penny! Pool is spotless with just one cycle a week. Filters are easy to clean and easy to operate. Climbs and scrubs water line and stairs with ease! Recommend the storage caddy for easy moving and storage. Highly recommended!

5 stars
Outstanding in cleaning the pool.

Stephen Jackson - Reviewed in the United States 🇺🇸 on December 28, 2018

Sigma pool cleaner even goes up sides and stairs, WOW! The pool has some staining and I thought I would have to pressure wash the pool. Sigma has gotten most of the staining off, Great Job. If I were to rate it from 1 to 10 I would give it a 11 or 12!

5 stars
Pool cleaner

Revil - Reviewed in the United States 🇺🇸 on October 6, 2020

Well built pool cleaner. Great warranty. Fixed problem I had immediately with no questions asked. Highly recommend.

5 stars
Technology has caught up!

R. Galle - Reviewed in the United States 🇺🇸 on August 9, 2019

I hated my other robot. It was an Aquabot TRC. Hard to clean. Broke frequently. I had given up on robots. Tried this one and it is far better. Easy to clean. Works great. Occasionally the track comes off but easy to put back on. Recommend the caddy.

3 stars
Careful of this product

Mike - Reviewed in the United States 🇺🇸 on August 25, 2019

It comes off track . Had the C 3 commercial robotic pool cleaner also it looks exactly the the same as this Sigma and shape. Two things in common both Maytronics products and the design is almost the same except the Sigma having and extra motor and it can use the Dolphin phone app.

5 stars
Well worth it and more.

Clay Marchand - Reviewed in the United States 🇺🇸 on June 2, 2018

5 Stars! The pictures attached show it. Our home flooded in 2016 and pool had been left alone till now. We added algea killer and shocked pool. This is pic showing algea that had went to bottom after dieing sucked right up. There is also chunks of concrete that it managed to pick up from a demo of steps into pool.

5 stars
Awesome cleaning

JAMES PRICE - Reviewed in the United States 🇺🇸 on October 31, 2020

Easy to use. It works better than I expected. Cleans my pool far above my expectations.

5 stars
Sparkling Clean Pool

Michelle Heverly - Reviewed in the United States 🇺🇸 on January 10, 2019

We are longtime dolphin owners. Our last model was nearly seven years old when it finally died. We bought this one based on the reviews and LOVE it. Its so much faster and cleans the wall of our pool so well. Definitely an upgrade and worth the investment.

5 stars
Very good

James Horvath - Reviewed in the United States 🇺🇸 on September 7, 2020

Works really well. Turn pool drains to skimmer only. Pool drains add to stopping sweeper on pool drains.

5 stars
Rumba for our Dock Pool!

Bonnie McDonald - Reviewed in the United States 🇺🇸 on April 7, 2020

This thing SMOKES what we were told to get by the pool company a year ago! EXPENSIVE but so far appears to do it's job WELL......

1 star
Dolphin sigma pool ornament

Michael V. - Reviewed in the United States 🇺🇸 on March 24, 2022

Sits on top of pool drain most of the time. Ordered the drain clips. Knocked one off after running cleaner for 6 hrs. Now it sits on top of $60 worth of drain clips. This is going to get expensive trying to fix this. It also gets stuck on the steps.

5 stars
Works great

Ray - Reviewed in the United States 🇺🇸 on November 22, 2020

It works great. Removed lots of algae from the surface of my pool.

5 stars
does a great job so I don't have to

srod - Reviewed in the United States 🇺🇸 on July 23, 2020

like the cleaning it does and also the fact that I can direct it to any missed spots .

5 stars
Thorough cleaning of plaster surfaces

JRK - Reviewed in the United States 🇺🇸 on August 21, 2018

Excellent through first three months of use. Efficient and thorough cleaning of all surfaces (bottom, walls, stairs) of our plaster pool. Filters very easy to rinse with hose. Easy storage away from pool with optional Premier Caddy, can be wheeled to pool deck and hooked up and functioning within a minute.

2 stars
Doesn’t work, can’t get ahold of anyone to help fix the monitor

Derick Foster - Reviewed in the United States 🇺🇸 on August 25, 2021

The monitor will not work, we cannot turn the machine on. We have only been using this for three months, it should not be broken already. Can someone please contact me about warranty and replacement!!

1 star
Came to me inoperable

Amazon Customer - Reviewed in the United States 🇺🇸 on March 28, 2022

I followed all instructions and it came inoperable. Didn’t start when plugged in after following all instructions. Had to send back to dolphin as they’re sending me a replacement. Didn’t get 1 use out of this thing.

5 stars
A great pool cleaner

W. Barcellona - Reviewed in the United States 🇺🇸 on July 2, 2020

I'm very happy with this pool cleaner. It works very well and keeps the cats entertained.

5 stars
Swim more than you clean the pool.

Amazon Customer - Reviewed in the United States 🇺🇸 on November 23, 2019

This thing is great. I have not vacuumed my pool all summer. I also throw it in the pool once a month to keep it clean all winter.

5 stars
Best pool cleaner.

Lisa - Reviewed in the United States 🇺🇸 on August 1, 2020

Loving our Dolphin Sigma. Extremely easy to use and it does a Great job.

5 stars
NUMERO UNO

Steven Epperson - Reviewed in the United States 🇺🇸 on October 21, 2019

The best yet! It’s simply amazing to watch this robot just sit on a wall as it’s doing its thing. It’s never been so easy to keep the pool sparkling!!!

5 stars
Very heavy.

Rich - Reviewed in the United States 🇺🇸 on July 29, 2018

My only compaint is that this is a heavy unit to lift out of the pool. Does a fantastic job of cleaning. The blue-tooth feature requires one to be very close to the power unit but I don't use it anyway.

5 stars
Worth the price

Toni-Ann - Reviewed in the United States 🇺🇸 on May 20, 2020

I have a rectangular pool w/ lots of benches & a table. This machine cleans it all!

3 stars
Second choice

Amazon Customer - Reviewed in the United States 🇺🇸 on October 17, 2020

Nice unit not very much capacity

2 stars
Bluetooth is Terrible

mjr - Reviewed in the United States 🇺🇸 on June 22, 2019

I purchased the Dolphin Sigma for the bluetooth capabilities. Unfortunately the app that you need to use it is absolutely useless. You can start and stop the cleaning cycle but cannot adjust the weekly cleaning schedule. The manifold is not very user friendly as the lights do not always stay on to indicate how often it will clean, or when the week is up. You cannot use a remote control with this model. If they fix the phone application to be actually useful it might be better.

5 stars
Awesome product worth the money.

Kate - Reviewed in the United States 🇺🇸 on November 2, 2018

I do t know how I made it this long without it! Turns on every day at the same time climbed the walls and the stairs cleandtthe benches does a great job and keeps my pool clean.

1 star
Gets stuck on my drain cover within minutes 100% of the time

Benjamin N. Dilts - Reviewed in the United States 🇺🇸 on May 8, 2022

I have never had this run its full cycle without getting stuck. Usually it's stuck within fifteen minutes or so.

3 stars
Support

e.ray r. - Reviewed in the United States 🇺🇸 on September 23, 2020

Customer support is good.

5 stars
superb cleaner

David W Jackson - Reviewed in the United States 🇺🇸 on December 10, 2020

works as advertised

5 stars
Great time saver!!!!

Vern - Reviewed in the United States 🇺🇸 on June 15, 2019

I finally found a product that works as advertised and has eliminated hours of cleaning. I am actually getting compliments on how my pool looks! I would recommend.

5 stars
Awesome and less work for us.

hereli alcuitas - Reviewed in the United States on June 14, 2020

The cleaning ability until the very bottom of th e pool.

5 stars
Best product for pool cleaning

Pegasus Realty - Reviewed in the United States on November 10, 2020

Cleaning the pool

5 stars
great works great

T N Texas - Reviewed in the United States on June 24, 2020

my pool loves it, I like it, saves me time!

5 stars
So easy!

Amazon Customer - Reviewed in the United States on July 18, 2018

I love it I throw it in the pool hit the on button and away it goes. The robot picks up big leaves and gets the entire pool every time I couldn’t be happier

5 stars
Worth it!

Amazon Customer - Reviewed in the United States on August 31, 2020

Extremely helpful in maintaining pool

2 stars
The rubber treads keep coming off the track!

Kat - Reviewed in the United States on July 20, 2020

Not only does the rubber treads keep coming off. It doesn't clean nearly as well as the supreme one we had from Dolphin. I choose this one because it was the newest design. But it was more expensive and it doesn't even suction up the dirt as well.

5 stars
As advertised

Janice Tull - Reviewed in the United States on June 12, 2020

Works right out of box Cleans very well

1 star
Beware before you buy

Matt E - Reviewed in the United States on July 17, 2020

First I want to say that this robot does a great job until it gets stuck on the drain. It gets stuck EVERY TIME. The picture is what my 2 drains look like. The customer service is weak at best. I emailed my issue and was given a 3rd party website to fix the issue. The 3rd party website doesn’t guarantee to fix the issue about getting stuck on the drain. I’m waiting on my “fix” to arrive. If you are on fence about purchasing this robot I would look elsewhere. For the price it’s not worth the hassle. I would not buy this again.

5 stars
Great

Linda Iafe - Reviewed in the United States on June 18, 2020

Was easy to operate and start up

5 stars
It cleaned the pool very well.

Daaron Fleeger - Reviewed in the United States on June 10, 2020

It cleaned the pool very well!

5 stars
Works great

Al Wills - Reviewed in the United States 🇺🇸 on July 23, 2019

Does a great job of keeping our pool bottom and walls clean. Love how easy the filters are to clean.

5 stars
Overall great

Dburroughs - Reviewed in the United States 🇺🇸 on June 15, 2019

Remote app has to be close to robot to connect hard to control with app other wise 5 stars

1 star
Sigma

Patrick Quinlan - Reviewed in the United States 🇺🇸 on July 25, 2019

I bought this after having a Dolphin Nautilus for 12-15 years. Worked fine and was of good quality. The only down side was it hung up on the drain. I thought this model would be ideal. I've had it now about 6 weeks and it is not anywhere near the Nautilus. The gyroscope seems to be nonexistent. It gets hung up on the drain half a dozen times during the cycle. It gets hung up on stairs. It does a poor job of cleaning the bottom. The app did not work so I bought the remote. That does not work either. I emailed the company a month ago. No response. Very disappointed.

5 stars
It's AMAZING

Debbie James - Reviewed in the United States 🇺🇸 on August 19, 2019

We LOVE our Dolphin. Robotic pool cleaners are the way to go and Dolphin Sigma is totally amazing!!

1 star
Sending back.

Carole L. Watkins - Reviewed in the United States 🇺🇸 on May 4, 2021

Have to send back. Way too heavy for me. Some on here say 15 lbs, no way. Also the baskets arent that big and hard to open. I see they raised the price another $100. They did that last week too I think. No caddy either. Just not worth the price but that just my opinion.

2 stars
NOT WORTH IT

Precise Comfort & Climate - Reviewed in the United States 🇺🇸 on July 20, 2020

Gets stuck on stairs every time. My old Dolphin Premier never had that problem. Hit or miss on Bluetooth connectivity. Going to try the Nautilus CC Supreme.

1 star
Gets stuck too often and does not clean my round swim spa

Karen McQuoid - Reviewed in the United States 🇺🇸 on September 19, 2020

Very disappointed given all the money we spent. I thought this could be set to run once per week, but if you have to be there to drop it into the pool that pretty much defeats the purpose. This product gets stuck on the steps in my pool 80% of the time and is useless in my round swimspa. It sits at the bottom and never figures out how to climb up the sides and ledges. I hope I can return this!!

5 stars
Great investment

Amazon Customer - Reviewed in the United States 🇺🇸 on November 30, 2019

Great product. Picks up small particles really well!

5 stars
Very happy!

Amazon Customer - Reviewed in the United States 🇺🇸 on July 16, 2018

Runs well, does a great job! Arrived in a timely fashion with no problems. We are very happy with the robot!

5 stars
Dolphin Sigma Pool Cleaner

Victoria L Smith - Reviewed in the United States 🇺🇸 on December 2, 2018

This the second Dolphin cleaner that I purchased. The product has worked just as expected, great company!!!!!

5 stars
easy to use and clean the filters

Kristina Dittmer - Reviewed in the United States on September 22, 2019

Does great job cleaning pool especially after dogs swim in it

1 star
Very Dissapointed

C. Jones - Reviewed in the United States on May 14, 2019

Pros: Quiet, filters easy to take off and clean. Cons: Didn't clean whole pool, even after running cycle four times. Machine would run right over dirt and not pick it up. Had much trouble connecting Bluetooth to power supply. Had to stay 1 foot from power supply at all times. Can't make any changes/control anything without app, can't use app if it doesn't connect with Bluetooth to power supply. No manual controls on power supply, all done with app - hence I am returning vacuum to Amazon after only one week of use.

5 stars
Excellent!

Huntgas - Reviewed in the United States on August 26, 2018

This thing is the best thing since sliced bread! Works just as advertised and we love it.

1 star
JUNK

Amazon Customer - Reviewed in the United States on November 11, 2020

Less than 3 months old and stopped working. Maytronics customer service is a joke. When and if you do finally get in contact with them they want you to pay to ship it back to them. That tells me they make a bad product and know it, paying for shipping on all their junk products would probably break them.

1 star
Came from the factory missing the two bottom doors made two phone calls have not received anything

Kenny F. - Reviewed in the United States on October 27, 2021

As of right now I would not recommend this product it came from the factory with missing parts going in over three weeks and cannot get it resolve

5 stars
Two thumbs up

chris - Reviewed in the United States on July 7, 2019

Does the job great! It’s even fun to watch

5 stars
This is a beast

JG - Reviewed in the United States on June 20, 2019

This is a beast. Cleans the pool very well.

5 stars
Dolphins a great product

Luca D. - Reviewed in the United States on July 1, 2018

It’s great better than the old one I had and that lasted 10 years

1 star
Does not work as advertised

Casey Carter - Reviewed in the United States on August 18, 2019

Do not buy this item. Advertised for avoiding pool drains. I swear this unit locks onto the drains and goes straight for it and gets stuck within the first 2 minutes. Dont even bother contacting Maytronics about it. They could care less. For 1500 this machine should work as advertised. And Amazon doesnt care either. They will return it but for a depreciated cost which is crazy.

2 stars
Not happy

Amazon Customer - Reviewed in the United States on June 17, 2019

It doesn't have the suction that I thought it would. And I'm finding out now that there is another brush for vinl pools that dosen't come with it. Ready to return it...

1 star
Waste of money. Just sits idle in the pool

AV - Reviewed in the United States 🇺🇸 on August 12, 2018

First 12 hours seemed great. Robot was running along cleaning. The following day,I tried turning it on. LED lights showed as if the robot is cleaning but it was not moving. Opened the app on my phone, it was also showing that the robot was on but it was still not moving. Took it out if the water, cleaned it, checked for debris. Nothing... Tried to find a manual that will show some troubleshooting. Nada. Extremely disappointed.

5 stars
Good value

Kaye - Reviewed in the United States 🇺🇸 on July 18, 2019

Love this thing!!

5 stars
Does a great job

SS429 - Reviewed in the United States 🇺🇸 on July 25, 2019

Great peoduct

5 stars
Five Stars

Amazon Customer - Reviewed in the United States 🇺🇸 on June 25, 2018

I love my Dolphin Sigma Robotic Pool Cleaner!

1 star
falls apart during operation within two weeks of purchase

John - Reviewed in the United States 🇺🇸 on June 3, 2019

Recently purchase this expensive cleaner that within two weeks of purchase it fell apart twice. The cap on the cleaning wheel pops off and stops. I have had to spend time finding the parts to put the thing together.Frustrating for something expensive. not well designed or put together.

5 stars
Love it

Christina Gwyn - Reviewed in the United States 🇺🇸 on May 18, 2019

Love it

1 star
Flimsy filters

Amazon Customer - Reviewed in the United States 🇺🇸 on August 26, 2020

I don't usually leave feedback, but after paying $1300 for this robot, I am not happy that the fine filter broke after second use. And company has not responded to my request for a replacement.

1 star
Do not use a robotic sweeper for large pools.

JC - Reviewed in the United States 🇺🇸 on September 15, 2019

This is not for a large pool, my 40,000 gallon pool requires longer clean times daily and the filters are too small. Might work if I felt like cleaning daily. Would never recommend this or any robotic sweeper for large pools.

1 star
Stuck on drain

J Higgs - Reviewed in the United States 🇺🇸 on August 20, 2020

It sticks on the drain every time I use it even after we installed covers over the drain. This is the third Dolphin and all have been great except for this one.

2 stars
can climb walls, just not my pool drains

JK - Reviewed in the United States 🇺🇸 on August 12, 2018

Does all it says, can put it on a schedule, yet gets stuck on my pool drains. Dolphin's solution is to replace the drains. . .

1 star
Pool cleaner

charlotte - Reviewed in the United States on January 5, 2019

I have question does the dolphin pool sigma work below 43 degrees Fahrenheit that's what the box says. Is there a reason for this can't give star rating yet we just got cleaner and studying up on it but it is beautiful looking

3 stars
Powerful for sure, BUT .......

Christopher D. Arnould - Reviewed in the United States on July 21, 2022

So first off I paid 1149.00 from poolbots.com during their black friday event, the Dolphin Sigma is very powerful and does a great job overall of cleaning my pool. It is easy to clean and maintain but there are things that you need to know before you decide to drop so much on this machine. 1st, I have already had the impeller motor burn out after 2 months of use. The customer service was FAST to reply and very helpful, however you need to know that they do not pay for shipping to a repair shop and with insurance that cost me 75$. Second, yes the robot get caught on the drain multiple times during the cleaning cycle..the solution is to replace the drain with a low profile drain if you can. The APP and the WIFI option are not worth the price, literally you can only turn on the unit and drive the unit if your choose but there is only 1 cleaning mode and no other features. When I replace this model I will buy a model that is cheaper because the ease of use and power of a dolphin is great, there is no sensor mapping, gyroscope is useless and the app is pointless . if you want the top of the line model this is NOT it.

5 stars
Five Stars

Kindle CustomerBill McHugh - Reviewed in the United States on October 11, 2018

Best pool vac ever

1 star
Stuck on the drain

John Tedesco - Reviewed in the United States on June 11, 2021

What good is it if it gets stuck on the drain. :(

1 star
Lemon?

J.B. - Reviewed in the United States on April 21, 2019

Purchased in October and already died. It turns on for seconds and powers off. Still waiting to hear back from manufacturer. Very frustrating to have this happen during pollen season. What a shame I had high hopes for this product.

1 star
Very unhappy with this item.

Agne l. - Reviewed in the United States on November 8, 2020

Does not clean any small particles on the bottom of the pool. The cassettes get full really fast. Does not climb walls

1 star
Not impressed

Kelly MacLean - Reviewed in the United States on April 1, 2021

Handle cracked within 6 months remote control tool feature not worth the extra cost

5 stars
Love it

Cayce - Reviewed in the United States on October 7, 2018

Works great

5 stars
Works as advertised

JA - Reviewed in the United States on July 14, 2018

Very Satisfied purchase

5 stars
Just as advertised

Amazon Customer - Reviewed in the United States on October 16, 2018

Perfect

1 star
Leaves streaks when pool has debris

Unhappy for the extremely high price. - Reviewed in the United States on July 26, 2019

Foam feet leave lines in the pool. The rubber does not touch the pool to clean. Must be a large piece of debris to pick up. My last dophin was much better.

1 star
Don't waste your money. Does not clean well.

Amazon Customer - Reviewed in the United States on May 7, 2019

Do not waste your money. Not worth a penny. Does not clean well. Weak. Missing many areas. Does not climb or clean wall or water line, thus misleading advertisement and product info.

1 star
it will stuck over drainage

Amazon Customer - Reviewed in the United States on October 29, 2019

good suction and good wall cleaning and clean well, but it will stuck on drainage every time it pass over it. I had to return it.

5 stars
You expect it to clean well, but there were unexpected benefits

94Q45T - Reviewed in the United States on May 4, 2022

The media could not be loaded. At the price, you expect great cleaning, and the Sigma delivers. What I did not expect was the impact on water balance. Prior to ordering the unit, I ordered chemicals to adjust the stabilizer, pH, and chlorine levels. The Sigma arrived before the chemicals did, and I put it to work immediately. During the cleaning process, this device processes thousands of gallons in a strong jet stream. Apparently, it picked up previously added but dormant chemicals from the walls and floor. I measured again before adding the new chemicals and the results were dramatically different (increased pH, lower CYA, normal chlorine). In the following weeks (our pool is open year round), the water balance has been more stable than previously. The operation is simple. Drop it in and turn it on. It remaps the pool with every cleaning and hits all the spots. Our pool is 46 years old, vinyl lined, and not smooth along the bottom. Manual cleaning is very difficult. None of that is a problem for the Sigma. It comes with two types of filters. The standard filter is a fine single layer nylon mesh which is good for leaves, sand, dog hair, etc. The other set (the Sigma houses 4 filters) looks like a small house furnace filter and those get the fine silt. On the initial cleaning, we used the standard filter, then re-cleaned with the fine filters. Incredible results! Silt is the bulk of what we get here, so we leave the fine filters in. During the off season or after windy days, we’ll change to the standard filter to pick up the big stuff. Even though it’s simple to use, there is a companion phone app that lets you start, stop, schedule, and manually drive the unit. It reports status (percent cleaned) and offers access to support, user profile, etc. I rarely use it. The unit can be left in the pool, but it should be removed when swimming. It’s large, and it’s powered by a long floating electrical cable. It’s well insulated and safe, but it’s tempting for kids to play with. Likely, we’ll leave it in the pool during cooler months and schedule cleanings with the app. For now, I drop it in and remove for every cleaning. We clean the filters every third run (more often with leaves and such). That’s easy to do, though the amount of yuck it vacuums surprises every time. This is a big unit which weighs about 35 pounds. It can be pulled to the edge of the water with the cable, but it should be lifted from the pool with the handle. This requires some strength and proper lifting technique. Our pool is 20x40 and takes the Sigma about 2.5 hours to clean. The included cable is long enough to allow place the external power supply/control unit at one end of our pool but several feet away in the cabana. Highly recommended.

1 star
Be careful of the vendor Pool Express

Arun Jain - Reviewed in the United States on June 20, 2019

Delivered product was used and scratched. Cable had discoloration. I didn't have to take it out of the box to know it has been used before.

1 star
Bad power supply

Barnaby West - Reviewed in the United States on December 11, 2019

Power supply broke with in a week

5 stars
Many pool robots get stuck on the floor drains. This is not the only one. Try this product:

Omar R. - Reviewed in the United States on May 13, 2022

POLARIS - 5820 UNICOVER MAIN DRAIN COVER

5 stars
Excellent pool robot

Frank Falconeri - Reviewed in the United States on April 4, 2022

After weeks of research and reading reviews I finally bought my 1st robotic pool cleaner, my budget was for around 5 to $800 but after reading the reviews this is the one that really was going to fill the needs that I had for my pool. It did not get hung up on my drain like some of the comments say it did not climb my walls immediately and was somewhat disappointed at this, then I realized there was too much algae on my walls I scrubbed them with the brush and then it began climbing the walls like mad cleaning the water line as well, I had it run about 2 cycles and was impressed by the cleaning power it had, the phone app is so so If you stand near it it will operate manually but not from far away. all in all it was a very good purchase except for the fact that it cost about $1400 I purchased this because because of its commercial grade quality and 3 year warranty

5 stars
Great machine, great customer service

De Grey - Reviewed in the United States on March 16, 2022

I bought a Sigma in 2018. Love, love, love the spotless cleaning (especially the water line), the suction is amazing and the ease of cleaning is crazy good. Recently I turned it on and it wouldn’t run. I took it to Maytronics (the maker) for repair. They got the unit in immediately (sent an email to let me know), fixed it and shipped it back … I had it back in 3 business days. AMAZING! They replaced the motor, floating power cord, tracks, etc. Other then the outside shell everything is new. We are blown away, it’s like having a new machine. The warranty (ours is 4 years) covers everything, customer service was so nice … even the emails letting you know it is being repaired and the second one saying the repair was completed and it’s being shipped back to you (w/tracking number). When this robot goes one day, I’ll be buying another. Thank you Maytronics!

1 star
Not for pool with curved wall and anti vortex main drain

Mary Hein - Reviewed in the United States on August 11, 2022

The Sigma is totally ineffective in my pool. The main problem is that it is constantly stuck on the main drain. I pull it off and it goes right back on and stays there. My second problem is my pool walls are curved and the Sigma can climb the wall to scrub but the scrubber is unable to reach the curved part of the wall. I understand why it doesn’t touch but it never occurred to me to consider this before i bought it. They should tell you not to buy if you have curved walls.

1 star
No customer support.

CandC - Reviewed in the United States 🇺🇸 on July 22, 2022

Ours quit working withing 30 days. I have spent countless hours on hold only to be disconected after hours. They never call back. Dont throw this kind of many away with this company.

1 star
Deteriorates being left in the water

Hill - Reviewed in the United States 🇺🇸 on July 9, 2022

Leave in the pool too long and the thing falls apart. Manufacturer needs to use better plastics. Pretty sure this is about 2 yrs old.

4 stars
Very similar to the older Maytronics/Dolphin Triton Plus design, but with extras

Eyecarehawaii - Reviewed in the United States 🇺🇸 on June 14, 2018

4.5 Stars, in my opinion. A very good, functional robotic pool vac with upgrades from previous models. I decided to try the Sigma because my older Maytronics/Dolphin Triton Plus (similar to the Maytronics M400) experienced a cable problem again and had to be sent back on warranty. I bought it two years ago and again, there appears to be an electrical connection problem in the swivel joint rendering it inoperable. (It happened once before a couple of months after buying it). Getting it serviced is no problem but you do have to pay for shipping there. I wanted to try the Sigma model because it advertised things like: SmartNav 3.0 Gyroscopic Navigation : No more watching your robot wander aimlessly questioning if it will ever pick up those leaves. Exclusive gyro delivers highly optimized scanning like commercial robots for a new level of clean. Tangle-Free Swivel : Patented swivel with 360 degree rotation. Without it, every cable tangles. Period. Full Wall and Waterline Cleaning:: Designed to clean all surfaces, even the tile and waterline with pinpoint precision. Reaches every square inch of the pool. Triple Motors: Not one, but 3 High Output DC motors. 24v motors require 87% less energy than previous gen robots. Independent Tracks : unlike entry-level robots, Sigma borrows tech from commercial robots- each track spins in opposite directions, turning on a dime. Massive Dual Top-Load Cartridges : large, easy and convenient- forget messy, cumbersome debris bags. PowerClean Dual Scrubbing Split Brushes : attack bacteria, algae, biofilm that destroy water quality. Drive by Bluetooth Remote Control : Download iPhone/Android App & drive with your phone! Programmable : Run automatically as you want - daily, 2x/week, 3x/week. Keeps pool clean and ready to enjoy. Best-in-class 3 yr warranty I got it today and unpacked it. Photos are included. For the most part it seems very similar to my older Maytronics/Dolphin Triton Plus Robotic Pool Cleaner (the newer "Dolphin Triton Plus" model is different). The primary differences are the addition of a 3rd motor, the gyroscopic device, and the Bluetooth control in the Sigma. The filter and power pack sizes are the same. The power pac even mounts correctly on the standard carrier I got for my Triton Plus. The Sigma does seem to have more vacuum power and climbs walls and steps better than my Triton Plus does. I got my Triton Plus back in April, 2016, and it included the caddy. Whether the Sigma is worth the extra $300 or not (did not come with caddy either) is yet to be seen. So far (I just got it today) it seems to be doing what I bought it for well.

5 stars
Customer care

Yulia - Reviewed in the United States 🇺🇸 on October 8, 2021

I would like to express my gratitude to the customer service team and true customer care. My Sigma is a year and a half old that worked well according to expectations. It had an issue with the power supply and cord that deteriorated over time due to weather conditions and they replaced for FREE not just those questioned parts but also filters and even shipped me back pool toy that I mistakenly sent in the box. Awesome product with exceptional customer service.

5 stars
Maytronics Cleaner

Donald Marfurt - Reviewed in the United States 🇺🇸 on July 18, 2021

Updated dolphin cleaner sigma cleaner worth the money would recommened

1 star
Don't buy if your pool has stairs

C. Joseph Li - Reviewed in the United States 🇺🇸 on July 1, 2022

The media could not be loaded. ------ 20220706 -- 3 - stars------ Rate from 1 to 3 stars. Maytronics' support was nice and gives quick feedback. I was totally surprised I got email over the July 4th long weekend from their support indicating they are still looking and have several leads. The robot still stuck sometimes, putting it to floor only mode helps a bit. But their support is good as far as experience goes. Its hard to find another company with good supports these days. Will update when I hear from them again. ------ original review below - 1 star ------- My pool is a simple 12k gallon rectangular pool with stairs. It managed to get stuck at the corner of a protruding stairs corner within 15 minutes. I had to ultimately push it off with the pool brush. Hoping it was a fluke, I left it to run unattended at night. In the morning sometimes it would sit in the same position (guess when it stuck) and sometimes doesn't. Even when it doesn't, it does not cover the pool adequately, not even close. I recently had yard work around the pool done, there are tiny dusts settled around the pool edges. After 3 complete run, we still have dusts around the edges, especially near the corner. I file a support ticket with Maytronics, their temporary solution was to disable the unit's wall climbing capability as a temporary solution and resort to manual cleaning on the walls and edges and given no ETA on the permanent solution. As currently stands, I wouldn't suggest the purchase if ur pool has protruding stairs. it runs ok if the stairs are flushed along with the walls with no protruding corners. Even though the unit has been only used less than a week, I can't return it now as I brought it in anticipation of pool construction completion, which got delayed with everything and by the time I use it the first time it was already a month since my purchase. So I guess I am stuck with this expensive paper weight for now until Maytronics has a permanent fix.

1 star
Does not clean well and requires multiple cycles

PA - Reviewed in the United States 🇺🇸 on November 25, 2019

After 10 years of use, we just had to replace our Kreepy Krauly Great White vacuum that ran off our pool pump. After reading many reviews, we decided to 'upgrade' to a self-sustained robotic pool cleaner. And then we chose the Dolphin Sigma because all the websites indicated it is 'the best'. Our first one was dead on arrival, so we had to send it back for a replacement. Here are my problems with this device after 'cleaning' once per week for about 6 weeks now: (1) Dolphin gives very few instructions on how to use the electric box and what the cycles are all about. So I have relied on the smartphone App. (2) My phone struggles to find the device, I usually have to open the App 3-5 times and sit my phone on top of the electric box before it will finally recognize the device. (3) Although advertised that it would, the robot has yet to climb and clean my steps or my bench. (4) The robot leaves trail marks that are not very noticeable, but easy to spot by someone trying to examine how well it is cleaning the pool. (5) The trail marks reveal a single circuit (2 1/2 hours for our pool) does not mean the robot covers the entire pool. There are sections of the pool the robot does not even get to in 2 1/2 hours. (17,000 gal pool). (6) The trail marks reveal that it takes the robot four cycles (10 hours of operation) to cover the entire pool (minus the steps/bench). Even after four cycles I can still see trail marks of 'cleaned' spots and dirty spots. (7) The device does an OK job on the water line, but again it only cleans the waterline for about 15% of the pool during a single cycle. In conclusion - the $400 Kreepy Krauly did a better job of cleaning our pool than this thing does. It is definitely not worth the money.

2 stars
Hangs up on pool drains

Russ S. Egan - Reviewed in the United States 🇺🇸 on December 12, 2019

This seems to be a good product in most respects. I don't have experience with other cleaners (first pool, first cleaner), but it seems like it would do a pretty good job cleaning, and it's easy to clean itself. But it has a fatal flaw: it gets hung up on the pool drains. At this price point, as a cutting edge, top-of-the-line product, it's inexcusable they haven't addressed this. We originally had pretty highly domed pool drains, and the robot would reliably get hung up on them every 10 min or so. Essentially, the robot has a flat bottom between the tracks, and it just bottoms out on the drain like a turtle on a mound. I tried a product for fixing this, which are these simple plastic clips which sit on top of the pool drain, and stick up from the drain a bit, to make it harder for the robot to bottom out without tipping off to one side, but the clips didn't work. We've now had the pool drains replaced with much flatter models, and that has greatly helped, it still gets hung up a couple times per run. We will try the clips again, then resort to "bridges", which are big rubber covers over top the drains with much shallower, broader sides. This would be simple to fix! Add a wheel in the center bottom, or add a lateral jet pushing in the same direction the wheel are going. Or something! Pools have drain covers, and all robots seem to be somewhat susceptible getting hung up on them. Come on people, this isn't rocket science!

1 star
Not Worth The Cost

JimSmith4321 - Reviewed in the United States 🇺🇸 on September 27, 2020

Dolphin S300 Review Monday 07 September 2020. Don't waste your money - only marginally better than suction side cleaners (such as KreepyKrauly SandShark). This thing (Dolphin S300) cost two or three times what they do and performs only a little (and I mean LITTLE) better. It will not scrub the entire bottom (makes several passes over the same area and completely misses others). The walls? Only about 15-30 % to the waterline. Above the water line? Less than about 10 %. It wanders around aimlessly (just like the suction side cleaners) and shows that it has no idea of the pool layout. When it begins to climb a wall more often than not it stops well below the water line, reverses back to the bottom, then takes off in a direction (probably) already visited and passes by areas not visited. My pool is a simple rectangle with straight walls curved to meet the bottom. Additionally, there is no indication as to where it currently is in the cleaning cycle (probably shouldn't say "cleaning cycle" - it's just a random walk for a period of time) - you have to wait until it comes to a stop and remains motionless.

2 stars
Sigma is stuck again

Calvin - Reviewed in the United States 🇺🇸 on June 13, 2020

This is not a set and forget pool cleaner. My sigma spends most of its time stuck on the main drain. I have to tug on the cord to get him back to work. I believe this is also why sopts of the pool are missed.

2 stars
Not worth the extra money

Joseph - Reviewed in the United States on July 19, 2018

Bought this thinking it would climb steps and it does not (see picture) although it tries very hard. Too early to tell how it cleans as my new pool is pretty clean but it does climb walls well and gets in ground filters good. The app has been worthless so far as many other people stated. I should have bought a lower level model and saved some money because all this one is good for is cleaning floor and walks as most others do. Will update review if anything changes but regretting spending this much money

5 stars
This thing is amazing!

Maxie - Reviewed in the United States on October 21, 2021

The media could not be loaded. Has no problem climbing the pool wall to the clean the tiles. It completely vacuums the bottom of the pool and leaves nothing behind. And it filters more pool water per minute then my high end Pentair Intelliflo does. I highly recommend this robotic pool cleaner.

3 stars
Good cleaner but extra features disappoint.

Richard M - Reviewed in the United States on November 7, 2020

Overall does a great job of cleaning debris from bottom of pool. However, for the price, I am disappointed that it regularly gets stuck on a step. Same place every time. So I cannot trust that it will do a complete job if I leave - I must check on it to see if it is stuck. So much for the “gyroscope” this model advertises! Also, the manual steering via Bluetooth is not responsive enough to make it useful. Long lag between pressing direction and robot actually moving. Also, connectivity is inconsistent.

5 stars
Great buy

Adam Horner - Reviewed in the United States on November 26, 2020

Works great. If it could only clean the filters out its self you wouldn't have to do a thing.

5 stars
A game changer!!

Kandi Eclavea - Reviewed in the United States on July 17, 2022

So glad we invested in this vacuum, it’s a life saver! No more slaving to clean the pool. Plug in up, throw it in the pool and it does all the work for you. Game changer for real!!

1 star
Se voltea al llegar al borde de la piscina

Alfredo Zepeda Parada - Reviewed in the United States on January 7, 2022

Me acaba de llegar el robot. Lo instalé y comenzó a trabajar. Pero al subir por las paredes y llegar al borde de la piscina, se voltea y no puede seguir limpiando. Estoy esperando la respuesta del vendedor, pero me parece muy mal que esto ocurra. Lo del giróscopo parece no funcionar.

5 stars
It is afraid of stairs, perfect.

JG - Reviewed in the United States on December 2, 2021

I bought the Nautilus CC prior to this model. It beached its self on our pool stairs twice in the first hour. Amazon refunded our money as soon as they received the retuned Nautilus. The Sigma literally pulls up to the stairs, stops, then backs up. Smart Bot!

5 stars
Da bestus bruddah. Dis won 🍒 device breh

tropix17 - Reviewed in the United States on February 5, 2022

🍒breh

5 stars
Buen equipo más ya se daño el módulo de control

Ignacio Alanís/miguel arevalo - Reviewed in the United States on June 5, 2022

Me agrado el equipo , es el segundo que adquiero mas este modelo se daño el módulo de control

5 stars
Highly recommend

JA - Reviewed in the United States on March 24, 2021

Works great and easy to control. Climbs walls with no problem.

5 stars
It works as expected.

Owen - Reviewed in the United States on September 3, 2021

I use the app to control it. I’m happy with the purchase. My only criticism is that it’s not great at cleaning the waterline. It gets up there and tries but I wipe the line manually and then let the cleaner take care of everything else. I do recommend it.


Question & Answers

Question
Why won't this cleaner climb the walls?
Answer

The above ground robotic pool cleaners are designed specifically for cleaning the FLOORS ONLY.

Question
What is the typical life span of a Dolphin robot?
Answer

The Dolphin is designed to last many seasons. However, the lifespan differs from Dolphin to Dolphin. Many different factors play a role, such as amount of use, pool chemistry, and pool surface.

Question
What DIY repairs can I complete on my Dolphin?
Answer

DIY repairs should be completed by an authorized technician. Please contact your local retailer for service, Maytronics directly at 1-888-365-7446 or the support page of our website.

Question
What are the voltage requirements for the Dolphin power supply?
Answer

The Dolphin requires a standard 120v outlet for power.

Question
Does it clean the curved edges from the pool bottom leading up the walls?
Answer

yes .. has a front roller/scrubber that will get that and also climb a bit above the surface and scrub the sidewalls. I have no complaints with this unit. The filters are also easy to clean .. though I bought spares ..not used them yet.

Question
Does it include the power supply?
Answer

Yes. The blue cable runs from the Dolphin unit to the power supply.

Question
Can this be used in a vinyl pool?
Answer

Yes, soft rubber scrubbing pads. I have a brand new pool, does well.

Question
Does this robot hook up like a manual vacuum? I spend 4-5 hours cleaning algea out of my pool.
Answer

No... it has its own power cord, comes from the control box which plugs into a GFCI 110v power outlet. It has a converter that runs the machine, I think 24 V DC. Set the time, do clean the two filter after each use for best performance. We love ours! Well worth the $$$ You don’t have to baby sit it or watch it, climbs the walls and scrubs the tiles also...... Sit back, enjoy your time while it works!!! AAA+++ is my score!

Question
How does this do on steps?
Answer

Overall the Sigma performs exceptionally well. I have had other robotic cleaners and this is superior. It will climb steps. I have a protruding set of steps and it will occasionally hang up a corner of those exterior steps, but it will dislodge itself and keep cleaning. I'm very pleased so far.

Question
Does it clean in an organized pattern? Or does it randomly clean?
Answer

This is a Great pool cleaner! It even scrubs up and down on the water line on the wall of the pool. It seems to run in an organized pattern. Again, it does a great job but it’s expensive. It even climbs pool steps.

Question
How is warranty handled as it cleary states in maytronics literature that there is no warranty on any product sold online ?
Answer

I bought my M400 at a local pool store 6 years ago and no need for warranty. I will not but from a local pool store again unless it is cheaper. I know there are DIY PVC pipe fitters and day job hydraulic engineers who can install pool stuff as well as some pool technicians. Especially a Dolphin cleaner?! Where is the added value? Is the pool store going to dispatch someone to spray out the filters when needed?

Question
Does it come with the remote ?
Answer

No supplied remote included. However, the current version Sigma (2021 for sure) uses your mobile phone as the remote controller/scheduler.

Question
Will it work with 230V?
Answer

No, it’s 110V and it’s a work horse!! Does an awesome job!

Question
Does this come with the caddy?
Answer

No, caddy must be purchased separately.

Question
Can this be used on above ground pools
Answer

I would see their FAQ, I think it is designed for inground

Question
Need new hose
Answer

The Dolphin Sigma does not have or use a hose.

Question
Purchased a Dolphin Sigma less than two years ago, now the no-return flaps have stretched & don't stay put on the filter intake. Please replace them.
Answer

Have you contacted maytronics? They may replace them under the 3 year warranty. If not the whole filter holder is a part that can be ordered.

Question
Can the Sigma firmware be upgraded?
Answer

I am not sure. Just purchased 3weeks now. Sorry.

Question
will it clean a sun deck its only 6 inch deep?
Answer

No… it take 12-14 + inches water to operate

Question
Does it map the pool?
Answer

Yes, it seems to map the pool.

Question
Robot a batería para piscina
Answer

Este modelo usa electricidad, no es a batería

Question
The directions say that when you first turn the unit on....the cycle lights will flash and you can choose 1,2 or 3 mine never flash...has anyone seen?
Answer

I don't remember what happened the FIRST time I turned it on at the power supply. The power switch is surrounded by multiple blue LEDS indicating power on.. Then you can press the select cycle button and rotate through the possible schedules (1,2,3) or none (3 Blue LEDs for 1,2 or 3).

Question
Replacement parts for sigma? Are they under another model?
Answer

No

Question
Does this come with a caddy?
Answer

No it doesn't come with a caddy. You have to purchase separately.

Question
Size of The box
Answer

24X20X14 inches.

Question
We have the aspen by thursday pools. it has a ledge along the bottom of the wall to stand on. will this be an issue for the sigma?
Answer

I am sure it will be fine. If it gets stuck then it should be able to get out. I like my dolphin, it works well.

Question
Does it have a leaf bag and does it do a good job picking up leaves off bottom?
Answer

2 different types of filters and yes it does an excellent job

Question
Can it be used directly in Indonesia with 220 v electricity, or must be changed first?
Answer

It comes with 110 out of the box

Question
I get a Lot of leaves. Will this work for that?
Answer

It can pick up leaves very well. If we have a whole bunch of leaves on the bottom (large piles) we will scoop them out first. Then let it settle awhile and then run the Dolphin. It is a fantastic, efficient, time-saving device.

Question
whats the length of the power cable ?
Answer

It’s about 6 feet long.

Question
which caddy matches this model?
Answer

I did not get a caddy. This model did not work on my pool. It kept getting stuck on the drains.

Question
Can this be used in above ground pools?
Answer

Yes! It works for all above ground pools and in ground pools! It works on vinyl, fiberglass, liner, gunite, and every other kind of pool!

Question
Does it come with a caddy?
Answer

No it does not. Just the robot and power supply. But the robot works awesome!

Question
What is The size of The box cause I want to send it in a plane
Answer

The size of the box is 23” x 20” x 14”

Question
Can it climb a vertical 3 ft wall from my deep end to my shallow end? And the vertical wall up to my steps and bench?
Answer

Mine successfully climbs 3 feet all around the pool; shallow end and deep end. Basically it climbs all the way to the pool edge and remains there for about a minute cleaning at the waters surface. As to stairs: mine only climbs the first step and drops back in the pool. One problem is the main drain in the deep end. The drain cover (Foxx Pool) is raised a couple of inches and every now and then the dolphin gets “stuck” on the cover. You then have to gently pull it back and it’s off to cleaning again. I’ve had this pool for 27 years and this cleaning unit is the best thing I’ve seen....love it and glad I bought it. It does a thorough cleaning and the filters and screens are a quick and easy clean up.

Question
is the caddy included?
Answer

Not sure what you mean by caddy. We keep it in the box it came in.....

Question
What is the size of the robot itself? ( Not the box size. Need to carry the unit in 2-3 carry on bags with friends
Answer

about the size of a microwave oven

Question
Who is this sold by?
Answer

Do you mean the manufacturer? I don’t remember.

Question
Can you program it to NOT climb the walls?
Answer

I don’t think so. But if you were bored or have plenty of time, you can control it with your phone using the app and Bluetooth feature.

Question
Is there anyone who bought this and didn’t like it? And Why?
Answer

I’ve owned one since December 2021 and would not buy it again. My biggest gripe is that it gets stuck on the bottom drain cover a lot. I have two drain, and they are not in suction mode, but when the Sigma straddles the cover, the drive belts on the sides lose contact with the floor and it hangs. I have to “rescue” my robot three to four times per cleaning cycle. Since Federal law mandated taller drain covers, this is probably an issue for most robots, so why haven’t the manufacturers designed in a center drive belt to overcome the straddle problem? Next, I have yet to get the WiFi connection to work, and I’m a retired networking engineer! Sent the unit back for repair to Maytronics, but they didn’t fix anything.

Question
Does it pick up leaves?
Answer

Yes, it picks up leaves. Does a really good job and is easy to clean.

Question
How often do you have to replace the filters?
Answer

The filters are re-useable. Should last a couple of years. However... you should clean them between use. I live in the south, lots of oak trees... the filter does great but must be washed out! Best not to let it run without cleaning, it won’t do you the job expected, cleans, does excellent. Climbs walls and no problem scrubbing the tiles!

Question
Can the remote control be used interchangeably with other Maytronic inground pool cleaners ?
Answer

I do not have the remote, just the phone app. Therefore do not know.

Question
What is ultra-fine filter mesh, how many microns?
Answer

Not sure about the specific microns, probably better to get a manufacturer spec sheet, but they do a great job with the fine dust that settles into my pool each week

Question
Does it work on kidney shaped pools?does it work on kidney shaped pools?
Answer

Yes it does! It works perfect on any shape of pools!

Question
What is the minimum depth of the water necessary for the Sigma to actually perform?
Answer

Roughly 20” of water. With SmartNav 2.0 technology, it won’t get stuck stranded out of water and will learn where the shallow areas of your pool area for optimized cleaning.

Question
Does the used unit come with a warranty of 3 years? can I add the extra warranty to the used unit?
Answer

yes, on the Sigma (and only the Sigma) it comes with a 3 year Warranty. I purchased an addition two years. but I believe you must do that when you purchase the Sigma. I also ordered the Caddie and cover

Question
Is the 3 year manufactures warranty valid if you buy through Amazon vendor?
Answer

Yes, registered the cleaner. Great cleaner, this my second one.

Question
How does it handle leaves? Looks like there’s no bag but only cartridges, so what happens with the large debris like leaves?
Answer

It handles them awesomely, the two cartridges hold quite a bit. This cleaner works perfect, zero problems with it, much better than the dolphin demo from the pool store.

Question
Do i need to order a separate power unit?
Answer

No sir you do not need to order a separate power unit. The manufacture does not want you using extension cords. By far this unit is far superior to any other product, that I have had in the past. The other units were in the same price range. Enjoy your clean pool, I have been for two seasons. E d

Question
Do you still have to brush pool or scrub pool walls?
Answer

Our pool is new so not really dirty. The robot does climb and clean the walls so I don't think I will have to brush. At least not very often.

Question
Using the phone app can you spot clean? Are there any Dophin robots that have spot clean capability?
Answer

In researching pool robot cleaners never read one that spot cleans because spot cleaning a pool makes zero sense. The Dolphin apps does let you manually drive it so I guess you can say it spot cleans. As a side note this model is amazing during a cleaning cycle it cleans 100% of the bottom it also cleans the walls of the pool and the tiles at the waterline. It never falls to climb which is simply amazing. I HIGHLY RECOMMEND this model and it’s worth every penny.

Question
How long is the cord from the power box to the cleaner?
Answer

real long.

Question
Which Caddy works with this cleaner? There's no mention of one, even on the Maytronics website.
Answer

Didn’t have one

Question
Does this actually scrub the surface? The video shows the "brushes" moving like wheels at the speed its moving. How would that scrub?
Answer

When the unit is moving it is not scrubbing, but the suctioning is pretty intense. When the unit climbs the side walls it stops moving at the water line and scrubs in place for a period of time, then releases and goes back down to the bottom. It does a decent job of cleaning the pool. If you want a whole pool scrubber, buy a brush.

Question
Does Amazon have a coupon for this
Answer

no

Question
I have a handicap ramp with 50 inch wide beach type entry. Will this clean to the top and then stop? I could put a board across the top of the entry.
Answer

It will clean as far as it can go and turn around once it sense it is out of water. Using its SmartNav 2.0, it will map out your pool and find the most effective cleaning route.

Question
can it be left in the all week?
Answer

Assuming you are asking if it can be left in pool. We have done that numerous times without issue - like over vacation, etc.

Question
When i downloaded the ios app for the sigma i only get manual drive and links & info, is that all the app can do?
Answer

That’s correct. There’s a lag in the drive mode so it’s not that easy to do it and also to me it seems that you can move the robot but there’s no suction happening as it moves. You also have to stay close to the base to maintain connection. I used it a couple of times but I ended up frustrated. So I let it clean the best it can and if I need to pick something up I’ll use the net. I also find the schedule option not very helpful either. Unless you plan on leaving the robot inside the pool for days of a time and keep the power connected unsupervised ... and fail to clean the filters in between cleaning cycles and lose suction and and the ability to “climb “ walls...

Question
Looking to upgrade but our old school Polaris bag gets choked with leaves & acorns on a daily basis. Anyone with trees have imput on capacity?
Answer

You will need a cleaner with a big bag for leaves not cartridges like the sigma. Dolphin brand is the best

Question
Does this clean up pool surface too? I get leaves and bugs at the pool surface
Answer

It does not clean the surface, but when the leaves and bugs sink, it will pick them up! It will clean the waterline and everywhere else in your pool!

Question
What is CleverClean? Does this model have it?
Answer

The Dolphin Sigma has the upgraded SmartNav 3.0. This is the newest navigation software from Dolphin. It is similar to CleverClean. The Sigma’s was upgraded for 2022 to the SmartNav 3.0 to ensure the best cleaning coverage in your pool!

Question
Does this come with a caddy or remote?
Answer

No remote.

Question
Can I use on a brand new pool?
Answer

Of course, no reason you can’t. Even brand new pools must be vacuumed.

Question
The 30 day free trial starts on the date of the purchase or the date of the delivery? Because there is about 10 days between purchase and delivery
Answer

You have 30 days from date of delivery to return this unit.

Question
Will this cleaner go onto the pool shelf/beach area?
Answer

Yes it's amazing I could not believe it went onto the shelf and also up the stairs!!!

Question
Hi. is it auto volt (110v-230v)? i will be using it in another country. thanks
Answer

Hi there, This unit runs on 110V. Any higher V will need to be adjusted accordingly. The control box can handle up to 230V, but the cable would need to be changed.

Question
Do we need a 110-220 transformer for 220 volts power ??. If so what’s the watts power transformer recommend ??
Answer

The specs on my transformer state Power Input 100-250VAC 50-60Hz.

Question
Does this come with the caddy?
Answer

no

Question
I’ve got a spa. Has anyone dropped it in their spa to see if it cleans it?
Answer

I've put it in my spa and it does fine. I stop it after 10 or 15 minutes otherwise it runs way too long.

Question
Is there a bracket I can buy to hang the control panel with?
Answer

Probably the safest thing to do is to call Dolphin customer support and ask which of their caddies works with your model. As an aside, this is very similar to the Dolphin-Maytronics M500 that I used before upgrading to this model. My Sigma didn't come with a caddy but the control panel fit on the caddy for the M500 perfectly. I suspect it shouldn't be too hard to find a compatible caddy for yours.

Question
Can you leave this in the pool? other robotics i have owned advised to have in pool only when cleaning. pita taking in/out.
Answer

I use mine year round in Hawaii and have found that after 5 years of not taking it out as often as I should, the power cord has begun to erode and open up. It’s best to take it out and let the cord dry straight and flat in the sun. This will prolong the life of the waterproof cord cover.

Question
Any trick to get it go all the way up the wall in the deep of the pool? Mine appears to only go half to a third of the way up. Pool is about about 8'
Answer

Mine goes above the water line. The rotor on top of the unit should be blowing out water. This is what holds it to the wall while the treads crawl. There four white/spongy wheels that need to be in place. They are delicate and don't last a long time. Ours broke off. That was when the Dolphin couldn't climb anymore. I replaced them and it's good to go again.

Question
How many times has it gotten stuck on your drain? (Or never?)
Answer

Never…. Only if there is a screw or stick, sticking up! I have had mine two years, runs daily -365…. Keep filters clean, no problems! (Oh- my dogs want to attack it but they/it gets close and then I have big chickens!!!) Mastiffs only way to go, best thing next to yourself to watch kids near or in the pool…..

Question
How does this compare to the dolphin nautilus cc supreme? it's hard to determine which one is the newer model.
Answer

With the research I did I believe the Sigma is the new model. My son has the Sigma and has had excellent results so I purchased one and couldn’t be happier with it.

Question
What caddy is recommended for this model
Answer

I wrote to the manufacturer, and they finally got back to me with the following: Sigma Caddy: 9996098-ASSY https://sunplay.com/products/maytronics-dolphin-universal-pool-cleaner-pro-caddy-9996098-assy

Question
Does this robot do a good job of cleaning the pool surface for small debris?
Answer

Yes, it has 2 different types of filters, one will pick up particles smaller than a grain of sand. My pool looks immaculate once it’s done. The key to its success is it ejects the water out from the top of the unit. Other brands like Polaris ejects water from the back which stirs up dirt and debris where the robotic has already cleaned.

Question
What model year is this one?
Answer

Not sure but mine was newest version in 2018 and looks like the above. Does a fantastic job and I’m very pleased with it.

Question
does this clean seat ledges?
Answer

This model climbs better that any previous version I've tied and can clean seat ledges that have enough water over them to allow it to get on the ledge. If there's only a little water over the seating ledge it won't get to it. So the bottom line is it depends on your layout.

Question
Could we use it with 220 V ?
Answer

After working overseas for many years and knowing your 220 v system I would say it should work just fine IF… only IF you use the stem down adapter to 110-120 It is a very nice machine (oh excuse me- my daughters say it’s the mean pool monster!) Does an excellent job. I’m not trying sell one. I’m not invested in the company. Just telling you my personal experience with it. We really like it. Oh the controls box steps it down to 24v so it’s not dangerous in the pool. Do clean the filter screens (2) after each use of pool if it gets lots dirt or trash from trees. You’ll love it! Well worth the money!

Question
Does this work well on fine particles? The mesh filter screens don't look as impressive as the pleated filters on some other models.
Answer

This model comes with two sets of filters. I have not used the mesh filter screens, which I believe are intended mostly for large debris when pool is very dirty. There is a set of pleated filters which are VERY effective on fine particles and are easy to clean with a garden hose. They are so effective that I usually clean them after 3-4 circuits around the pool.

Question
Why did the pricejump$500??
Answer

Demand

Question
Do you have to put it on a app could you set it manually
Answer

You have the option to do either! You can set it on the app or manually!

Question
How is the filter capacity of the cartridge filters, compared to the Dolphin models that have the large rectangular filter basket?
Answer

I no longer have this Dolphin model as it stopped working after about 10 months. I bought a different model which did not have all the bells and whistles and it has the same size baskets. I could not in all honesty recommend this cleaner. I took it to have it repaired and had to pay $95.00 for the service and received a refund from Amazon which was not the full amount I paid for this model.

Question
What is the max distance and number of walls in between to get the best WiFi signal?
Answer

My wifi works great with it. So buy one and you’ll find out how it works at your home.

Question
How does it compare to the Dolphin M 400?
Answer

I like the Sigma a lot, best pool vac I have ever had. Have never had a M 400 so I can not make a comparison.

Question
Our deep end is 12’ - anyone know if it will reach the waterline on 12’ walls?
Answer

I will try to remember to measure tomorrow but it certainly should. There is a bunch of extra electrical cord, enough that I put the controller well past one end of the pool and sit it in the steps of my deck. My pool is 18 x 36 - 8’ deep. You want this machine. It is sweet!!

Question
I’ve seen some varied reviews on how effectively this robot cleans steps. Any feedback from recent purchasers?
Answer

I previously reviewed this Sigma as “afraid” of the steps in my pool. It approaches, starts to climb, then stops before backing up to continue the cleaning cycle. We have a stainless steel rail dividing our steps so it avoids getting wrapped around the handrail. So, it doesn’t clean the steps. But unlike one robot we had that beached itself twice in the first hour of operation, we love our Sigma!

Question
$1449 is the normal price. What’s up?
Answer

I’m not sure because this is the 1st time I bought one. I looked at other Dolphin vacuums and they were also expensive. This looks like it is the latest model.

Question
how much dog hair would this hold?
Answer

More than what your dog could reasonably shed. However, there’s a fan on top that needs to be cleaned when hair is entangled in it. You may find, after the first cleaning, that it would behoove you to buy Fido a kiddie pool of his own.

Question
Does the Sigma get stuck on drains?
Answer

It is stuck on the my anti vortex drain so much that it is virtually unusable. I pull it off the drain and it goes right back on. Tried main drain clip on and zodiac unibridge as recommended by Maytronics and neither worked. Wish I could return the Sigma.

Question
Is it warrantied for saltwater pools?
Answer

I don't know about the warranty, but the user's manual states it may be used in pools with NaCl concentrations up to 5000 ppm.

Question
how long is the power cord?
Answer

We have a 20 x 46 x 24 Lazy “L”. It reaches every corner, the sides, and up the stairs.

Question
Is this lightweight?
Answer

Yes easy to take out of water

Question
In what way is this worth the extra $400 over the new quantum or triton plus?
Answer

Turns on a dime

Question
Does it work on fiberglass pools
Answer

Mine works great in my vinyl lined pool. Al

Question
Do you have a version of this that will work in a 220v outlet?
Answer

I have no idea. It runs on 110.

Question
How does the pool vacuum work on ceramic tile pools?
Answer

I have a fiberglass pool with ceramic tile at the top, it does clean those tiles on the top not sure about a whole ceramic tile pool ???

Question
Can you increase the duration of cleaning ?
Answer

Go to cleaning mode pick days & time

Question
What are the filter part numbers, so replacements can be ordered?
Answer

Dolphin Ultra Fine Cartridge Filter Panels (4-pack) #9991432-R4

Question
can the power supply be left out in the rain on the cart (likely not plugged in)?
Answer

Not recommended. It can tolerate a few minutes of rain until it can be brought under cover but is not waterproof and should not be left out in a steady rain.

Question
Am I the only one with anti tangle swivel issues? I have to untwist the cord about every 3 runs..
Answer

My cord has never tangled. My Sigma is in the water 24/7 on a weekly program. Same with my previous Dolphin which I had for 6 years, two cords because my cats ate one cord.

Question
Is there a 30 day return policy ?
Answer

Yes there is.

Question
Difference betweem in this model and the nautilus cc supreme?
Answer

I don't know the difference but I can tell you the Dolphin Sigma is amazing!!!!!

Question
Has anyone found weights to use on the hose to keep it underwater?
Answer

Since it does a 360 degree turn at times, the hose needs to float on the water.

Question
Does the cord get tangled at all?
Answer

I've had it for a couple months now. I keep it in the water 100% of the time, and run it roughly every other day. After a week or 2 the cord can get twisted (2 or 3 twists at most), but never tangled. With the robot still in the water, I slowly pull the cord out of the water and lay it on the pool deck. The cord untwists itself with the help of the swivel. I take it out of the water roughly every 2 weeks to clean the filters, then put it right back in. Excellent machine - pool has never been cleaner.

Question
My pool is 60 feet long but I have an outlet in the pool house right in the middle. Would it reach both ends?
Answer

It would depend on the width of the pool too. My pool is 50' long x 20' wide and I have an outlet in the middle too. The pool cleaner easily reaches both ends and the opposite side of the pool.

Question
why does the track keep falling off looks like its missing a side shield
Answer

I've not had a problem with the track never falls off.

Question
Can i use the Dolphin Sigma on a vinyl pool?
Answer

yes. it works well but so you know it needs to be plugged into electrical outlet. also very heavy so you would also want to purchase the caddy

Question
Simple question, what's the purpose of scheduling when you have to still manually drop it in the pool on the day you are cleaning?
Answer

I have this pool cleaner and I have never used this feature. Don’t see the point since you have to put the cleaner in the pool like you mentioned. Not like you leave the cleaner in the pool to schedule a cleaning. Now it would be great if it just left it’s station and moved it’s self into the pool. Now that is when the scheduling feature would work lol. Now this cleaner I have no complaints about it. Works great.

Question
Does it have other mode than Regular? My app always shows this mode and there is no way to change it.
Answer

Hi I’m not aware of any other mode however you might look into the specific dolphin Sigma remote to see if it offers more than the app or just the unit itself

Question
Is it safe for vinyl liner and salt water pools?
Answer

I do not know about the vinyl liner part, but have been using it in a salt water pool and works great. Only issue I have had is it getting stuck on the water intake covers on the bottom of the pool, tried the after market add ons that Dolpin refers to and they did not work for me - so, have to manually pull it off the covers when it gets stuck (have 3 of them to get stuck on)

Question
How long is the cord?
Answer

50 feet

Question
Do I need an extension cord to use this (for power supply) ? Will the cleaner pull the extension extension cord into the pool? My nearest plug is far
Answer

You will definitely need an extension cord but the robot has a separate sturdy waterproof cable that attaches to the control unit

Question
What are the dimensions of the power unit?
Answer

about the size of a shoe box

Question
How do you get it repair if required? Do you pay for shipping or does Maytronics cover 100% all costs?
Answer

That would be a question for the vendor/manufacturer. Have not needed maintenance/repair yet.

Question
Has anyone bought this from terra direct? have you had any issues with product or seller? does maytronics support warranty from them?
Answer

We purchased from amazon. I love it and haven’t needed any repair or anything as yet. Does an amazing job and worth every penny we spent. We have a variable speed pump so the vacuum was not doing a good job because of the speed of the pump. I hope that answered your questions.

Question
Does it show the water temp on the app?
Answer

No it does not display the water temp on the app, however we also use a Water Guru. It goes into the skimmer and it will display not only the water temp but also the chlorine and alkalinity of your pool… Hope this helps

Question
will it clean a 60 foot pool?
Answer

if you place it in the center of pool length , then yes

Question
up to 50feet as in length please? or as total area? I mean what about volume?
Answer

I can only say that my pool is 32’ long with about 12’ of power cable out of the pool. It goes to the far end with cable left over. Area and volume coverage is dependent on time run.

Question
What is maximum pool gallon wise this unit will clean?
Answer

Our pool is about 40,000 gallons and it does a fabulous job in about 3 hours.

Question
Where can i get a replacement pool cable for the sigma? anyone have a part number?
Answer

Look in your book or on line

Question
Do you have to use a caddy?
Answer

While it’s not mandatory, it really is a must have as the unit has some weight to it and the caddy houses the control unit. The caddy is worth every penny!

Question
How old os this model? I see reviews from 2017.
Answer

I purchased my Sigma in May 2021 and could not be happier with it. Best pool cleaner I have ever owned.

Question
Does it work with 220v?
Answer

No

Question
Why is this so expensive? It is on other websites for 1295.00. Is there a difference in this model?
Answer

There are many different models with different features. I am not sure which other models you are referring to; however, I suggest that you compare the features with each model before you make a purchase. I was particularly interested in the number of gallons per minute flow rate and the variable speeds of the pump compared to a single speed pump. I hope this helps.

Question
Can this be used on a pool with an infinity/negative edge?
Answer

I do not know. I don’t have an infinity/negative edge pool. But the dolphin sigma has been a great investment so far. It does a great job!

Question
Does this unit have multiple cleaning options or only deep clean?
Answer

Hello, The Sigma will clean floor and walls or just walls. I’ve not tried the wall only function. I drop it in and 2-1/2 hours later it’s spotless. The only issue I have is that will “occasionally” get stuck on top of my floor drains. Overall, best pool cleaner I’ve ever had.

Question
Will the robot connect to Wi-Fi with the router being approximately 50+ feet from the pool?
Answer

I have Wi-Fi coverage in the pool area. I haven't had any connection issues. As long as you have adequate Wi-Fi coverage in your pool area, the robot and the controller should connect with no problem.

Question
does the dophin sigma pick tile up and other debree and are there parts list if needed?
Answer

Yes

Question
Can you keep this in pool?
Answer

I personally drop the Sigma in every other day during the swimming season. There is a weekly schedule on the App so you could leave it in for a week at a time. However, you should not leave the unit and cable in the pool while swimming. It cleans so well that I find it easier to drop and go when needed. I also purchased the caddy to keep it neat and orderly. I absolutely love this pool cleaner. Hands down the best one I have ever owned.

Question
How long is the cord from the power box to the cleaner?
Answer

My unit measured 57'7" (17.5 m)

Question
what is the minimum depth that this unit can operate in?.. Have a shallow end that is 13 inches deep will this unit be able to clean?
Answer

It should be able to clean that end.

Question
Can this clean a 60 foot pool?
Answer

Our pool is 38 feet and it does a great job. It's a hard worker, I would guess it could clean your pool.

Question
what does this weigh?
Answer

Under 25 pounds dry. A little heavier as you pull it out of the pool until the water drains. So worth it!!! Two and a half hours of cleaning at under 15 cents!!

Question
Same unit as I bought June 2018? Updated?
Answer

This is the first time I am using a robotic pool cleaner and it has made my life easier in keeping the pool clean. Cannot comment about a comparison since this is the first unit I ever had. My daughter purchase one about five years ago and this I can tell you that is a definite upgrade from her unit.

Question
What type of Warranty is available from Dolphin on the Sigma and/or from third parties?
Answer

have no idea. cleaner works really well.

Question
Does this work in above ground pool
Answer

I’m not sure. I have a below ground pool. It could abrade your vinyl liner.


Pool Attributes

Specifications

Pool Types In Ground
Pool Size 50 ft
Pool Shape Rectangle, Oval, or Freeform
Obstacles Steps, Ladder, Drain Cover, Ledges, Pop-Ups
Surface Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass
Cleaning
Waterline Cleaning Yes
Number of Filters Included 2
Filter Cleaning Ultra-fine and Standard Filter Cartridge sets
Cleaning Coverage Floor, Walls, Waterline
Cleaning Cycle(s) 2.5 hrs
Number of Brushes 4
Connectivity & Automation
Remote operation Yes - Through App
WiFi / Bluetooth WiFi: Yes
Bluetooth: Yes
Smartphone App Yes
Automated Weekly Timer Yes
Other
Full Bag Indicator Yes
Cable Length 60 ft
Anti-Tangling Swivel Yes
Restocking Fee No
Warranty 3 Years
Caddy Included Optional Caddies Available
Official Website Sigma Official Site
Part Number 99991036-SPLI
ASIN B07CZ1XVZX

Dolphin Sigma
Robot Class: In Ground

Accessories

Terra Premium Caddy

Terra Caddy

The Must-Have Dolphin Accessory

Weather and UV-Resistant. Terra Caddy is the go-to Dolphin Caddy. Sealed and protected, the Terra Caddy is covered in a protect resin that cures to an extremely hard layer, making it resistant to scratches and weathering. The resin cures very hard, making it solvent-resistant and scratch-resistant. This level of protection makes the Terra Caddy stand up to rain, sunshine, termites, and more.


Dolphin Universal Caddy

Dolphin Caddy

Move and Store

A robotic pool cleaner is an investment, so make sure to protect it. The Dolphin Universal Caddy is a solid caddy that gets the job done. Easily store and transport your robotic pool cleaner to keep it lasting for years to come.


Dolphin Robotic Pool Cleaner Replacement Parts

Replacement Parts

Need extra filters, replacement power supply, or new climbing rings?

Looking for Dolphin Sigma replacement parts? Well, you've come to the right place. Shop all replacement parts for the Dolphin Sigma and all other Dolphin models.


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