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Robotic Cleaners

Robotic Pool Cleaner Replacement Parts: Filters, Brushes, Tracks, Cables

Which wear parts a robot has, how the makers say to check them, and how to find the exact part for your model without guessing.

As an Amazon Associate I earn from qualifying purchases. The "Search Amazon" buttons and the "Worth a look" links on this page are Amazon affiliate links; we show no prices or ratings. Facts recorded Oct 25, 2026 from the official sources linked on each section. Manufacturer pages and rules change, so check the current version and your model's manual.

Difficulty: easy (wear parts only)

Safety first: robots, power supplies and batteries

  • GFCI only. Polaris says its robotic cleaners plug into a GFCI outlet, and Maytronics' U.S. Dolphin LIBERTY safety sheet says the power supply must be on a GFCI-protected circuit. If a GFCI trips by itself, both say not to use the product until the problem is corrected.
  • Distance from the water. The Polaris 9350/9450/9550 manual says to keep the control unit at least 5 ft from the pool edge (U.S. National Electrical Code). Maytronics says to place the LIBERTY battery charger at least 10 ft from the pool edge and at least 4 in above the ground. No extension cords (both makers).
  • Nobody swims with the robot in the pool. Both makers say to take the cleaner out before people get in.
  • Don't open power supplies, chargers or batteries. Polaris says never to open the charging station and not to attempt repair of the cleaner, charging station or cord; Maytronics says the LIBERTY battery is non-replaceable and not to open it. Use the maker's support instead.
  • Impeller blades. Maytronics says to use the impeller safety tool and keep fingers away from the impeller and drive belt.

Sources: Polaris pool cleaners; Polaris 9350/9450/9550 owner's manual; Polaris FREEDOM owner's manual; Maytronics LIBERTY safety instructions (USA)

The question

"Which filter, brush, track or cable fits my exact robot, and is it worth replacing, or should I buy a new cleaner?" Start with the cheap wear parts and the maker's own maintenance steps.

Filters and canisters

  • Dolphin LIBERTY: Maytronics recommends quick-rinsing the filter immediately after taking the robot out, so debris doesn't harden on it, and taking apart and hosing the two ultra-fine filter panels about once a month. Its troubleshooting table says a clean filter "should be white"; if it stays brown after cleaning, "it may be time for a replacement filter."
  • Polaris 9350/9450/9550: Polaris says to clean the filter canister after each cleaning cycle.
  • Polaris (fine debris): Polaris's blog says fine debris like algae, silt and salt can clog the canister's inner mesh; brush it gently with a small brush or sponge and mild soap, then rinse with a hose.

Source: Dolphin LIBERTY user instructions; Polaris 9350/9450/9550 owner's manual; Polaris: robotic cleaner struggling to climb wall

Brushes

Polaris says the 9350/9450/9550 has PVC brushes with "wear" indicators. Replace the brushes as soon as one wear indicator is reached, even if the wear is uneven; Polaris recommends replacing them "when the rubber is worn down to the top of the wear indicator (or every two years, whichever comes first)." The FREEDOM manual also tells you to check the brush wear indicators if the cleaner isn't cleaning well.

Source: Polaris 9350/9450/9550 owner's manual, section 6.3; Polaris FREEDOM owner's manual

Tires and tracks

The Polaris 9350/9450/9550 manual says to check tires for wear and replace them as necessary if the cleaner stops climbing, and includes tire-replacement steps. The FREEDOM manual lists worn track treads as a cause of not climbing walls. Maytronics' LIBERTY troubleshooting says to carefully remove any object stuck in the tracks or wheels.

Source: Polaris 9350/9450/9550 owner's manual; Polaris FREEDOM owner's manual; Dolphin LIBERTY user instructions

Floating cable (corded robots)

  • Polaris: after every cycle, unplug the cleaner at the control unit, take it out, and untangle kinks and coils starting at the cleaner head. Lay the cable in the sun to loosen "tangling memory." Never lift the cleaner out by the floating cable.
  • Polaris: don't use the cleaner or control unit if the cord is worn or damaged; contact Polaris Technical Support for servicing and replacement of the cord.

Source: Polaris 9350/9450/9550 owner's manual

Impeller (not a wear part, but a common clog)

Maytronics says hair and debris can get stuck in the LIBERTY's impeller and that it should be cleaned periodically, with the charger connected (which turns the robot off) and the impeller safety tool inserted. Follow the manual's steps exactly.

Source: Dolphin LIBERTY user instructions, section 7.1

Finding the exact part for your model

  1. Find the model number on the robot or in your paperwork. Polaris model names on the U.S. site include the SKU (for example F9450, F9550, FFREEDOM).
  2. Open the manual for that model on the maker's site. Both Polaris pages we checked link their owner's manuals directly.
  3. Get the part number from the manufacturer, not from a "fits most" listing. If you can't find it, contact the maker with your model and serial number: Polaris 1-800-822-7933 / productsupport@fluidra.com; Maytronics U.S. 1-888-365-7446 / customersupport@maytronicsus.com.
  4. Then shop by that exact part number.

Source: Polaris 9450 Sport; Polaris 9350/9450/9550 owner's manual; Dolphin LIBERTY user instructions (contact page)

Why no part numbers here

Polaris's parts pages didn't show a readable parts list when we checked, and the owner's manuals we read don't list wear-part numbers. We won't publish part numbers we can't confirm on an official page, and we don't call third-party parts "equivalent" or "universal."

Repair or replace the robot?

None of the manufacturer documents we read gives a lifespan or a "replace the robot when" rule, so we don't either. The makers' path is: replace worn filters, brushes, tires or tracks; follow the troubleshooting table; and if the fault continues, contact your dealer or the manufacturer. See Robotic pool cleaner troubleshooting.

Should you DIY? / When to call a pro

Fine to DIY: emptying and rinsing filters, checking brushes and tracks for wear, untangling the cable, clearing debris from wheels, and the user-level steps in your manual.

Call the manufacturer or dealer: motor units, power supplies, chargers, batteries, damaged cords and anything else beyond "routine cleaning and maintenance" (Polaris says that work must be done by a qualified professional). Call a licensed electrician: if the outlet isn't GFCI-protected or the GFCI trips by itself.

See our full When to Call a Pro page. Follow your model's manual; this site isn't a substitute for it, and it isn't legal advice.

If your model isn't listed

The numbers on this page come from specific manufacturer documents and models. If your equipment isn't one of them, don't assume the same numbers apply: find the model number on the rating plate, open that model's manual on the manufacturer's site, or contact the manufacturer. You can also email us with the brand and model number.

Facts from the manufacturer (and where else they came from)

Where to look

Filters, brushes and tracks should be bought by the manufacturer's part number. These buttons cover cleaning supplies the makers mention. As an Amazon Associate I earn from qualifying purchases.

  • Small soft brush: Polaris suggests a small brush or sponge with mild soap for a clogged canisterSearch Amazon
  • Hose spray nozzle: for rinsing filters and canistersSearch Amazon