# Pool Robot Filtration Microns Explained (150 vs 3 Micron) | Robot Pool Cleaner Guide > What micron ratings mean on a robotic pool cleaner filter: 200, 180 and 150 micron baskets vs 3-micron ultra-fine inserts, what each catches, maintenance trade-offs and which robots offer them. - Source: https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-filtration-microns-explained/ - Markdown version: https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-filtration-microns-explained.md --- - [Home](https://robotpoolcleanerguide.com/) - [Guides](https://robotpoolcleanerguide.com/guides/) - Pool Robot Filtration Explained: 150 vs 180 vs 3 Micron Filters (Do You Need Ultra-Fine?) Know the numbers # Pool Robot Filtration Explained: 150 vs 180 vs 3 Micron Filters (Do You Need Ultra-Fine?) Updated October 12, 2026 By [Robot Pool Cleaner Guide Editorial Team](https://robotpoolcleanerguide.com/about/) [How we research](https://robotpoolcleanerguide.com/how-we-research/) We may earn a commission when you buy through links on this page, at no extra cost to you. Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - A **micron rating** is the size of particle a filter can catch; lower is finer. Pool-robot baskets are typically **150–200 µm**. - A **3 µm ultra-fine** insert (Aiper Scuba S1 and S3; optional on Beatbot Sora models) catches dust, fine sand and pollen, but **clogs faster**. - Fine filtration helps with **cloudy water and fine dust**; a bigger coarse basket helps with **leaves**. - More filtration means more rinsing, so match the filter to your debris, not the biggest claim on the box. ## Our top picks - 1![Aiper Scuba S3](https://robotpoolcleanerguide.com/_astro/aiper-scuba-s3.axhMfHc9_Z1q82gP.webp)180 µm mesh plus a replaceable 3 µm ultra-fine insert, about $700[Aiper Scuba S3](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s3/)Cordless · Up to 4 hr · Floor + Walls + Waterline8.5**$$**$$Mid-rangePrice tier: Mid-range, $500–$1,000[Check price on Amazon](https://www.amazon.com/dp/B0HDC7Q945?tag=room4205-20) - 2![Aiper Scuba S1 (2026)](https://robotpoolcleanerguide.com/_astro/aiper-scuba-s1.BMEJqQm5_23fkjO.webp)180 µm plus 3 µm ultra-fine filter, 2-year warranty, just under $500[Aiper Scuba S1 (2026)](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s1/)Cordless · Up to 3 hr · Floor + Walls + Waterline8.3**$**$$$BudgetPrice tier: Budget, under $500[Check price](https://www.amazon.com/dp/B0HHRS6FMF?tag=room4205-20) ### On this page 7 sections - [What a micron is](#what-a-micron-is) - [The three tiers](#the-three-tiers) - [Where each tier wins](#where-each-tier-wins) - [The catch: clogging and maintenance](#the-catch-clogging-and-maintenance) - [Does fine filtration replace your pump filter?](#does-fine-filtration-replace-your-pump-filter) - [How to choose](#how-to-choose) - [FAQ](#faq) ## Before you choose - [Best Cordless Robotic Pool Cleaners of 2026: Runtime, Coverage & What You Give Up](https://robotpoolcleanerguide.com/posts/best-cordless-robotic-pool-cleaners/) - [Corded vs Cordless Robotic Pool Cleaners: Which Is Better in 2026?](https://robotpoolcleanerguide.com/posts/corded-vs-cordless-robotic-pool-cleaners/) - [Robotic Pool Cleaner Coverage & Runtime Ratings Explained (What the Numbers Really Mean)](https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-coverage-ratings-explained/) Open a pool robot’s spec sheet and you’ll find a micron rating: 200 µm on the Betta SE Plus, 180 on the Aiper Scuba S1 and S3, 150 on the Beatbot Sora models and Aiper EcoSurfer S2, and a “3-micron” option on several. It sounds like a simple more-is-better scale. It isn’t. ## What a micron is A micron is a millionth of a meter. For scale, a human hair is roughly 50–100 microns wide. Filter ratings describe the particle size a filter can trap: a 150-micron filter lets through particles smaller than that, a 3-micron filter catches almost everything visible and a lot that isn’t. ## The three tiers | Rating | Typical on | What it catches | | --- | --- | --- | | 200 µm | Betta SE Plus basket | Leaves, bugs, pollen clumps, pet hair | | 150–180 µm | Most baskets: Beatbot Sora, Aiper EcoSurfer S2, Scuba S1/S3 mesh, Wybot C2 Vision | Leaves, sand and coarse dust | | 3 µm | Aiper Scuba S1/S3 insert; optional on Beatbot Sora | Fine dust, silt, pollen and fine sediment that cloud water | ## Where each tier wins Coarse and large baskets (150–200 µm) keep running with leaf loads. The [Sora 30](https://robotpoolcleanerguide.com/pool-robots/beatbot-sora-30/) has a 5 L basket; the [Betta SE Plus](https://robotpoolcleanerguide.com/pool-robots/betta-se-plus/) has an extra-large basket on the surface. For leaf-heavy pools, capacity matters more than micron. Ultra-fine (3 µm) matters if the water gets cloudy from fine particles that pass through a standard basket. The [Scuba S3](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s3/) and [S1](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s1/) ship with the option; the Sora 10 and Sora 30 offer it as an accessory. ## The catch: clogging and maintenance Finer filters fill faster, so the robot may slow or stop sooner, and you’ll rinse more often. A first-of-season clean in a dirty pool can overwhelm any filter. Remove the ultra-fine insert for heavy debris and put it back for polishing. See [maintenance](https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-maintenance/) and [troubleshooting](https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-problems-troubleshooting/) for what to do when suction drops. ## Does fine filtration replace your pump filter? No. Your pool’s circulation filter does the real water polishing; a robot’s filter reduces how much fine debris is stirred up and re-circulated. It helps clarity, but it isn’t a substitute for your main filter or water chemistry. ## How to choose - **Leafy pool:** a big basket and a skimmer. See [skimmer vs vacuum robot](https://robotpoolcleanerguide.com/posts/robotic-pool-skimmer-vs-vacuum-robot/). - **Dusty, sandy or pollen-heavy pool:** a robot with a 3 µm option (Scuba S1 or S3). - **Both:** run the coarse basket first, then switch to the fine filter. For the full set of picks, see the [best robotic pool cleaners of 2026](https://robotpoolcleanerguide.com/posts/best-robotic-pool-cleaners-2026/). ## Don't guess. Calculate. - [🎯 Robot Matcher](https://robotpoolcleanerguide.com/tools/robot-matcher/): which robots fit your pool - [📐 Pool Volume Calculator](https://robotpoolcleanerguide.com/tools/pool-volume-calculator/): gallons and surface area - [💰 Robot vs Pool Service](https://robotpoolcleanerguide.com/tools/cost-calculator/): how fast it pays back - [📊 Compare every robot](https://robotpoolcleanerguide.com/pool-robots/): sortable spec table ## Frequently asked questions ### What does micron mean on a pool robot filter? A micron (µm) is one-millionth of a meter. A filter's micron rating is roughly the particle size it traps; lower numbers catch finer particles. For scale, a human hair is about 50–100 microns wide. ### Is a 3-micron pool robot filter worth it? If your problem is fine dust, silt, pollen or cloudy water, yes. If your debris is mostly leaves, a larger basket matters more, since fine filters clog quickly and need more frequent rinsing. ### Which robots have a 3-micron filter? The Aiper Scuba S1 (2026) and S3 include a 3-micron ultra-fine filter or insert alongside a 180-micron standard filter. Beatbot lists a 3-micron option for the Sora models. ### How often should I clean a fine filter? Rinse after every run, and expect to deep-clean or replace it on the manufacturer's schedule. See our maintenance guide. Our #1 pick 180 µm mesh plus a replaceable 3 µm ultra-fine insert, about $700 ![Aiper Scuba S3](https://robotpoolcleanerguide.com/_astro/aiper-scuba-s3.axhMfHc9_RqqN9.webp) ### [Aiper Scuba S3](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s3/) 8.5 - Cordless - Up to 4 hr - Floor + Walls + Waterline In-ground pool owners who care most about water clarity and want 3-micron fine filtration in a light, one-hand-liftable cordless robot. $$$$ Mid-range Price tier: Mid-range, $500–$1,000 today's price on Amazon [Check price on Amazon](https://www.amazon.com/dp/B0HDC7Q945?tag=room4205-20)[Read the full review](https://robotpoolcleanerguide.com/pool-robots/aiper-scuba-s3/) [🎯 Not sure which fits? Match a robot to your pool type, size and debris in 30 seconds.](https://robotpoolcleanerguide.com/tools/robot-matcher/)[📊 Compare every robot Sortable chart of every robot we track.](https://robotpoolcleanerguide.com/pool-robots/) ## Keep reading [Cordless ### Best Cordless Robotic Pool Cleaners of 2026: Runtime, Coverage & What You Give Up The best cordless pool robots of 2026 compared: Beatbot AquaSense 2, Sora 10, Aiper Scuba S3 and S1, Wybot C2 Vision. Runtime, surfaces cleaned, price and the trade-offs. Updated Oct 12, 2026](https://robotpoolcleanerguide.com/posts/best-cordless-robotic-pool-cleaners/)[Know the trade-offs ### Corded vs Cordless Robotic Pool Cleaners: Which Is Better in 2026? Corded vs cordless robotic pool cleaners compared: runtime, suction, waterline cleaning, handling, lifespan, warranty and price, with the best corded and cordless picks for 2026. Updated Oct 12, 2026](https://robotpoolcleanerguide.com/posts/corded-vs-cordless-robotic-pool-cleaners/)[Know the numbers ### Robotic Pool Cleaner Coverage & Runtime Ratings Explained (What the Numbers Really Mean) What '3,229 sq ft coverage' and '300 minutes runtime' mean on a robotic pool cleaner, why they're best-case figures, and how to size a corded or cordless robot to your pool. Updated Oct 12, 2026](https://robotpoolcleanerguide.com/posts/robotic-pool-cleaner-coverage-ratings-explained/) 180 µm mesh plus a replaceable 3 µm ultra-fine insert, about $700 Scuba S3 $$$$ Mid-range Price tier: Mid-range, $500–$1,000 [Check price](https://www.amazon.com/dp/B0HDC7Q945?tag=room4205-20)