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Dolphin M400 Poolside Waterline Cleaning 5

Dolphin M400 Robotic Pool Cleaner

Reviewed by Robert Knight

0 | Reviews

$1699

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Key Features

✓Instore-Only Exclusive - The Dolphin M600 is only available in stores. Many online models are available, often cheaper, and with similar or more features such as the Dolphin Explorer E70, Dolphin Premier, and Dolphin Sigma.
✓Includes Ultrafine and Standard Filters - We were impressed the M400 includes the standard filters and ultrafine filters in the box
✓Full Pool Coverage - The M400 had full pool coverage of the floor, walls, and even waterline
✓Expensive - Compared to online models, the M600 was significantly more expensive and had a similar feature set. We recommend the cleaner, but Dolphin has some better values online if you want a better bang for your buck
✓myDolphin Plus App - The app was easy to use and setup. With Wi-Fi, you can connect from anywhere and control your robot.
✓Includes Caddy - The M400 includes a Dolphin Universal Caddy in the box

Scorecard

Ratings

Waterline Cleaning	Excellent
Filter	Bad
Coverage	Good
User Experience	Good
Warranty	Excellent
Overall Score	76

Highs & Lows

The pros and cons of the Dolphin M400

Highs

Instore-Only Exclusive
Includes Ultrafine and Standard Filters
Full Pool Coverage
myDolphin Plus App
Includes Caddy

Lows

Expensive

Shop Best Price Read Full Review

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 M400 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.

Wall Climbing

Provides floor and wall coverage

Dolphin M400 is able to easily clean your walls of your pool.The Dolphin M400 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 M400 from anywhere.

With the its smartphone app, you can schedule cleanings, manually control, and fine tune your Dolphin M400.

Anti-Tangle Swivel

No more tangled cords.

With an Anti-tangle Swivel, the Dolphin M400 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.

Ultra Efficient

Save Hundreds of Dollars Cleaning Your Pool a Year!

Dolphin M400 saves hundreds of dollars a year in energy when compared to pressure-side or suction-side cleaners.

Plug and Play

Simply Plug Dolphin M400 in and start cleaning!

Set up has never been easier. No installation needed. Dolphin M400 is ready to go right out of the box. No extra pumps, plumbing, or anything else needed. Simply plug M400 and start cleaning!

Precise Navigation

Navigate your pool efficiently

™ 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

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Maytronics

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Availability

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In-Store Exclusive

$1699

Similar Robots

The Dolphin M400 is only sold in-stores. Robots that are sold in-stores only are often overpriced when compared to their online counterparts. Usually marked up $100-300 more and with a shorter warranty, you may want to consider an alternative robot.

Looking for the best deal on the Dolphin M400 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.

Dolphin Sigma

4.9

693 Reviews $1897

Highs

Dolphin's Best Pool Robot Yet - More Features, More Filters, & More Power.
Most Advanced Dolphin Ever - Utilizes Gyroscope
Includes NanoFilters - Unlock a Deeper Clean
Quad Scrubbing Brushes - 4X Cleaning Power
Utilizes 3 Dolphin ProLine Commercial-Grade Motors

Learn more about Sigma Compare M400 vs Sigma

Dolphin Premier

4.9

2163 Reviews $1747

Highs

Only Dolphin with a Leaf Bag - includes Multi-Media
Waterline Cleaning Beast
New, High Performing Dolphin ProLine Model
NanoFiltration - Premier's NanoFilters allow it to clean deeper than standard Dolphin pool robots
3 Year Warranty

Learn more about Premier Compare M400 vs Premier

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Questions & Answers

Common questions about the Dolphin M400

Why won't this cleaner climb the walls?

Above-ground robotic pool cleaners are designed to clean the floor only. In-ground cleaners with wall-climbing capability are built differently; check your model's specs for floor-only vs floor, walls, and waterline.

How long do robotic pool cleaners last?

With proper care and normal use, most robotic pool cleaners last 3–7 years. Lifespan depends on usage frequency, pool chemistry, surface type, and whether you store and maintain the unit as recommended.

Can I leave my robotic pool cleaner in the pool?

It's best to remove the cleaner after each cycle and store it in a shaded, dry place. Leaving it in the pool can expose it to sun, chemicals, and debris, which can shorten its life.

Do robotic pool cleaners need to be plugged in?

Most plug into a standard 120V outlet via a low-voltage cable and control unit. A few models are cordless and run on a rechargeable battery; check your product's specifications.

How often should I run my robotic pool cleaner?

Running it 2–3 times per week is typical for many pools. Heavy debris, high use, or large pools may require more frequent runs; smaller or covered pools may need less.

Why is my robotic pool cleaner not moving?

Check that the power supply is on and the cable isn't tangled or caught. Ensure the filter basket isn't overfull and that the unit isn't stuck on a step or drain. If it still doesn't move, refer to the manual or contact support.

Do I need to use my pool pump when running the robot?

No. Robotic pool cleaners run on their own power and filtration. You can run them with the pump off, which can save energy compared to pressure or suction-side cleaners.

What voltage does a robotic pool cleaner need?

Most residential robotic pool cleaners use a standard 120V outlet. The control box steps this down to low voltage for the floating cable. Check your manual for your model's requirements.

Can I repair my robotic pool cleaner myself?

Simple tasks like cleaning filters and unclogging impellers are usually fine. For motor, cable, or electronics issues, use an authorized technician or the manufacturer's support to avoid voiding the warranty.

What's the difference between cartridge filters and a debris bag?

Cartridge filters are reusable: you rinse or wash them and put them back. Debris bags are often disposable or optional for heavy leaf pickup. Some robots include both; check your model for options.

What is the typical life span of a Dolphin robot?

Dolphin robots are designed to last many seasons. Lifespan varies by model, amount of use, pool chemistry, and pool surface. Following the manual and storing the unit properly helps maximize life.

What DIY repairs can I complete on my Dolphin?

DIY repairs should be done by an authorized technician. Contact your local retailer, Maytronics at 1-888-365-7446, or the support page on the manufacturer's website for service.

What are the voltage requirements for the Dolphin power supply?

Dolphin units use a standard 120V outlet. The power supply converts this to the low voltage used by the cleaner. Do not use extension cords unless specified in the manual.

Where can I get Dolphin replacement parts and filters?

Replacement parts and filters are available through authorized Dolphin/Maytronics dealers, the manufacturer's website, and many pool retailers. Use genuine parts to keep the warranty valid.

Does my Dolphin work with saltwater pools?

Yes. Dolphin robotic pool cleaners are built to work in both chlorine and saltwater pools. Rinse the unit with fresh water after use to limit chemical and salt buildup.

Pool Types	In Ground
Pool Size	50 ft
Pool Shape	Rectangle, Oval, or Freeform
Obstacles	Steps, Ladder, Drain Cover, Ledges, Pop-Ups
Surface	Gunite, Fiberglass, Vinyl, Liner

Product Manual

Quick Start Guide

Waterline Cleaning	Yes
Number of Filters Included	Ultra-Fine Filter Kit
Filter Cleaning	Top Access
Cleaning Coverage	Floor, Walls and Waterline
Cleaning Cycle(s)	2.5 hrs
Number of Brushes	3

Remote operation	No
WiFi / Bluetooth	WiFi: Yes Bluetooth: Yes
Smartphone App	Yes
Automated Weekly Timer	Yes

Full Bag Indicator	No
Cable Length	60 ft
Anti-Tangling Swivel	Yes
Restocking Fee	No No Restocking Fee Ever.
Warranty	3 Years
Caddy Included	Optional Caddies Available
Part Number	99991046-USI
ASIN