Pool robot care through the season: filters, brushes, chlorine and closing up for winter

The chores a pool robot creates

A robotic cleaner takes over the worst of pool vacuuming, but it brings a few small jobs of its own. Swim University, the pool-care site and YouTube channel, sums up the routine in its robotic cleaner buying guide: take the cleaner out once its cycle is finished, empty and rinse the filter after every use, check the brushes and wheels for debris, and replace worn brushes promptly.

This guide puts that routine into an order through the season. It's based on care documents from Maytronics (Dolphin), Aiper and Beatbot plus a parts retailer's repair guides. Your own manual overrides anything general here, especially on battery care and chemistry limits. If you're still choosing a robot, the companion guide to cordless versus corded pool robots (cordless vs corded pool robots) covers that decision.

After every run: lift it out, rinse it, empty it

Maytronics recommends rinsing the filter as soon as the robot comes out of the water, before debris dries onto the mesh, and rinsing the whole cleaner with fresh water to remove chlorine, which it says wears plastic parts. It calls that rinse especially important in saltwater pools. Beatbot's FAQ gives the same advice for salt pools, to prevent build-up and corrosion.

Don't leave the cleaner parked in the pool between runs. Aiper says an overnight or weekend stay is generally fine, but argues that permanent submersion will likely cut a robot's lifespan in half. It also warns that debris left in the basket can rot, affect water chemistry and encourage algae inside the robot. Maytronics adds that the power supply belongs in the shade, away from strong sun. For corded models like the Dolphin Nautilus CC Plus (Dolphin Nautilus CC Plus review), that's part of choosing where the cable runs on the deck.

Every couple of weeks: impeller and cable

Maytronics suggests cleaning the impeller, the underwater propeller that drives suction, every two weeks. Disconnect the power first, or for a cordless model, switch it off as the manual directs. It's a reasonable assumption that anything that slips past the filter can end up there, so a quick look costs little.

On corded robots, the cable gets its own routine. Maytronics says to coil it like a garden hose, and if it tangles, to unplug it, lay it out flat and recoil it. Swim University suggests that a kinked cord be wrapped in the opposite direction from usual for a while to work the twist out. Either way, a tangled cable can limit how far the robot reaches, so check it when you lift the robot out.

Brushes and filters are wear parts

Brushes don't come with a fixed replacement date, so watch for symptoms. A parts guide from retailer InyoPools for Dolphin Nautilus combined brushes lists two: the cleaner picks up dirt less effectively than it used to, or it stops climbing walls, which points to worn climbing rings. Before ordering parts, rule out a clogged filter or a jammed impeller, which can cause the same symptoms. If the robot has sat unused for a while, InyoPools says the brushes and rings can go stiff, and soaking them in water until they're pliable helps.

Beatbot's FAQ suggests replacing filters every one to two seasons, or sooner if they tear or stop cleaning well, and notes that brushes are usually excluded from warranty as wear parts. It's worth knowing the part numbers for your model before mid-season. Robots with fine dual-layer filters, such as the WYBOT C2 (WYBOT C2 review), make the after-run rinse especially important, because fine media clog faster.

Chlorine, shock and algae clean-ups

High chlorine is hard on seals, plastics and brushes. Aiper says to take the robot out before shocking the pool and to wait about 24 hours, until chlorine is back in the normal range, before putting it back in. It gives that normal range as roughly 1–5 ppm. Aiper also advises keeping the robot out during a sustained algae treatment, both because of the prolonged chemical exposure and because dead algae clogs filters quickly. Beatbot's FAQ likewise says to wait until chlorine returns to safe levels after shocking, without naming a number.

Treat those figures as a vendor's rule of thumb, and check them against your model's manual and your own test kit. Maytronics' broader point holds for any brand: test and balance the water regularly, because chemistry affects the robot as well as the swimmers.

Closing up for a Canadian winter

Maytronics' winter storage advice, on its Canadian site, is straightforward. Drain all water using the drain plug or valve your manual identifies, clean the filter and refit the basket, coil the cable without kinks, stand the robot upright on its caddy, switch it off and disconnect it, and keep it away from sun, rain and frost. It gives an ideal storage range of 5–45°C (41–113°F). It also notes that a robot left unused for 21 days or more may go into sleep mode and needs to be connected to its charger to wake up.

That 5°C floor is the Canadian catch. An unheated garage or pool shed in much of the country falls well below it in January, so a basement, utility room or other heated space is the safer home for the off-season. Aiper's cold-season care page for Canada adds steps for cordless robots: power off and unplug, clean the shells, wheels, roller brushes and charging port, dry it, box it in a cool, ventilated spot, and charge it to 40–60% every two months. It also says never to charge in direct sunlight and to charge fully before the first run in spring.

Cordless owners should set a calendar reminder for those top-ups. That applies to robots like the Aiper Scuba X1 (Aiper Scuba X1 review), Beatbot AquaSense 2 (Beatbot AquaSense 2 review) and Dolphin Liberty 400 (Dolphin Liberty 400 review), since a battery allowed to run flat over the winter is an easy way to start the season with a robot that won't wake up. Battery advice differs between brands, so follow your manual where it gives a figure.

From a tech standpoint

Most pool robot problems come down to habits rather than defects: a filter left to dry dirty, a robot left soaking in shock-level chlorine, a battery left flat in a freezing garage. Rinse after every run, clean the impeller on a schedule, treat brushes and filters as consumables, and store the robot clean, dry and above 5°C. Those habits matter more to its lifespan than any feature on the box.