Practical research · 9 September 2026
Pool Robot Leaves Fine Dirt? Diagnose What Gets Missed
A robot can collect leaves and still leave fine dust behind. Before assuming it needs more suction, check whether it reaches the dirty area, whether the filter is installed correctly and whether that filter is designed for the particles you are seeing.
Filter identity matters more than a headline
Source table by Karl Murphy for Pool Robot Advisor. Selected manufacturer listings checked 21 September 2026. Published runtime is a manufacturer claim and depends on mode and conditions; it is not our measured endurance.
| Model / revision | Included filtration | Optional filter / part identity | Runtime and surface scope | Warranty region | Source |
|---|---|---|---|---|---|
| Beatbot Sora 30 | Included 150 µm basket; 5.2 L | Ultra-Fine Dual Filter Basket (Sora 30), advertised 3 µm. Numeric replacement-part ID not verified. | Up to 5 h floor-only; 4.5 h floor/wall/waterline. Brand lists concrete, vinyl, fiberglass, tile and stainless steel. | US page: 2 years. Confirm exact coverage and seller eligibility. | Brand listing ↗ |
| Aiper Scuba S1 — 2026 Upgrade | Dual-filtration claim; exact micron table not verified in the accessible US listing | Included insert and replacement-part number not verified. Do not transfer an older S1 revision’s filter specification. | US listing advertises 270 min. Surface-material limits require the exact 2026 manual. | US listing: 2 years from purchase. Extended care plans are separate. | Brand listing ↗ |
Download the filter evidence table (CSV).
Sora 30 availability caveat: the same page describes its 3 µm accessory as coming in future months and elsewhere gives an earlier expected shipping date. We could not resolve current stock or a numeric replacement-part identifier. Confirm the exact Sora 30 basket and shipping status with the seller before ordering.
Ask for a complete filter match
Request the robot model and revision, basket or insert name, numeric part number, included versus optional status, micron specification and the region-specific warranty document. Keep a screenshot of the reply. A smaller advertised micron rating does not by itself prove better coverage, flow, sealing or overall pool cleanliness.
For the rest of the catalogue, use each model’s specification and source records. An unverified replacement part is deliberately left unverified rather than filled with a similar model’s number.
Separate coverage from capture
Watch from outside the pool during a normal approved cycle, with swimmers kept out as the manual requires. Does the robot cross the dirty patch, or does it never reach it? Missed corners suggest a coverage, obstacle or pool-compatibility question. A plume after the robot crosses a patch suggests a different capture or disturbance question.
Photograph the floor before and after the cycle from a consistent location. Record the selected mode, charge state, filter and debris type. Avoid changing the operating mode and filter together during the first comparison, because that makes the improvement harder to explain.
Check the exact filter system
With the robot safely removed and switched off according to its instructions, inspect the basket, panels and seals. Confirm they are properly seated and undamaged. Clean them with the approved method. A finer filter that is clogged or bypassed may not produce the result you expect.
Maytronics distinguishes fine and ultra-fine filters and notes that availability varies by model. Treat a manufacturer's micron figure as specific to that filter, not a universal label shared by every brand. Check whether the finer insert is included, optional or unsupported for the exact robot you own.
Use a symptom sheet
The table helps organize a support request. It does not diagnose algae or water chemistry from appearance. What looks like dust may need a different pool-care response, so keep uncertain material descriptions provisional.
| Observed result | Investigate |
|---|---|
| Dirty area never crossed | Mode, obstacles and supported pool geometry |
| Large debris collected; dust remains | Fine-particle filter suitability |
| Debris escapes around basket | Seating, seals and damage |
| Performance fades during cycle | Filter loading and approved cleaning interval |
| Cloudiness persists beyond cleaning | Water treatment and main filtration |
Know what a robot cannot establish
Mechanical cleaning is only one part of pool maintenance. Collecting debris does not disinfect the water or prove the chemistry is balanced. A brush may disturb deposits without removing all suspended particles. Use appropriate water testing and professional guidance for suspected algae or persistent cloudiness.
Do not add chemicals to the robot's filter or run it during treatment unless the product and robot instructions explicitly allow it. Follow the model's permitted water conditions and treatment intervals. A more expensive robot is not a substitute for addressing the pool's water-care system.
Retest before replacing
After checking filter fit and selecting a supported filter, repeat a comparable cycle and document the result. Record how much debris was removed and whether the same patch remains. If coverage is consistently missing a particular slope or shelf, ask the manufacturer about compatibility rather than judging the whole machine by advertised pool area.
For a support request, include the model, pool surface and shape, filter part number, cycle mode and before/after photographs. Those details are more actionable than 'the vacuum is weak' and can help distinguish an accessory problem from a genuine equipment fault.