Robots That Filter Fine Dust and Algae (50 Microns or Finer)

Cloudy water that the pool filter will not clear is usually particles under 50 microns: fine dust, silt and the first stage of algae. Most robots ship with a 150 to 180 micron basket, which catches sand and leaves and lets all of that straight through. The robots below put a finer layer in the box. Two practical costs come with it: an ultra-fine layer clogs faster, so it needs rinsing after nearly every run, and several makers recommend the coarse basket alone after a storm so the fine one does not blind.

How this list is ordered: Every robot whose in-box filter the maker rates at 50 µm or finer, ordered by that rating and then by price. Optional filters sold separately do not count. 5 of the catalog’s robots qualify.

1. 

   1Aiper

   ~$650

   Aiper Scuba S3

   Aiper's S3 brings the 3-micron ultra-fine layer down to $650 and parks at the waterline for retrieval.

   Finest filter

   3 µm

   Pool fit

   ~79 ft (floor only)

2. AiperScuba X1Cordless floor+wall+waterline

   2Aiper

   ~$800

   Aiper Scuba X1

   Aiper's X1 scrubs horizontally up to two inches above the waterline, pulls 6,600 gallons an hour through a five-litre basket and a 3-micron MicroMesh layer, and charges on a wireless dock.

   Finest filter

   3 µm

   Pool fit

   ~55 ftclaims ~66 ft

3. 

   3Aiper

   ~$1,000

   Aiper Scuba S1 Pro

   The S1 Pro adds a 3-micron ultra-fine layer under the 180-micron basket, horizontal waterline scrubbing, the Aiper app and a 66-foot rating to the S1 recipe.

   Finest filter

   3 µm

   Pool fit

   ~55 ftclaims ~66 ft

4. 

   4WYBOT

   ~$500

   WYBOT C2

   WYBOT's 2026 C2 puts a 10-micron ultra-fine filter behind its 180-micron cartridges for $500, and returns to the pool edge when it is done.

   Finest filter

   10 µm

   Pool fit

   ~68 ft (floor only)

5. 

   5WYBOT

   ~$630

   WYBOT C2 Vision

   A C2 with a camera.

   Finest filter

   10 µm

   Pool fit

   ~68 ft (floor only)