Robots are excellent algae fighters — they do the two things that matter: scrub it loose and vacuum it up. The catch is what happens to that algae once it enters the filter.
Scrubbing Is the Robot's Superpower
Unlike suction-side or pressure-side cleaners, a robot actively scrubs surfaces with its brushes. Most algae clings to the floor, walls, and waterline, so mechanically breaking it loose is exactly what is needed — and it is where robots outperform other cleaners. Learn more in how do pool robots work.
Filtration Is Everything
Algae particles are tiny. With a coarse cartridge, the robot lifts algae only for it to flow straight back into the pool. To actually capture and remove it, you need fine media. NanoFilters use pleated microfiber to trap algae, pollen, and fine silt — a massive difference for clearing green or cloudy water. This is why we call them essential for algae; see do I need NanoFilters.
Heavy Blooms Need Chemistry Too
For a serious green pool, no cleaner alone is enough. Balance and shock the water, brush, and run the robot in repeated cycles with NanoFilters, rinsing the filter between runs — the same approach we recommend for pool opening. A powerful corded robot like the Dolphin Sigma with NanoFilters is our top pick for algae-prone pools. See also our best pool robot for algae guide.
