How to Store a Pool Cleaner for the Off Season

Why off-season storage matters

A pool cleaner that sits through winter in the wrong conditions can come back with cracked seals, a degraded battery, or a motor that will not start. The Pool & Hot Tub Alliance (PHTA), the industry body that develops American National Standards for pool equipment, emphasizes that proper maintenance and best practices protect equipment and extend its service life. Off-season storage is a form of pool cleaner maintenance and prevents damage that happens when water freezes, chemicals sit stagnant, and rubber parts dry out.

The exact steps depend on the type of cleaner you own, but the principle is the same: remove the unit from the pool, clean it, dry it, and store it in a place that stays above freezing. For robotic cleaners with batteries, the storage charge level can also affect how well the battery holds up over several months.

Step 1: Clean the cleaner before storage

Before any cleaner goes into storage, it needs to be free of debris, sand, and chemical residue. Empty the debris bag or canister and rinse it out. Rinse the body, brushes, and tracks with fresh water to remove chlorine, salt, and any dirt that could harden or corrode parts over the winter.

Pay attention to the filter. A filter left with organic matter inside can develop mold or odors, and dried debris can be hard to remove in spring. Rinse the filter until the water runs clear, then let it dry completely before reassembling. Storing a filter that is still damp encourages mildew. For detailed steps, see how to clean a pool cleaner.

For suction-side and pressure-side cleaners, also rinse the hose interior. Debris trapped inside a hose can dry and restrict flow when you reconnect everything in the spring. Run fresh water through the hose and hang it to drain.

Step 2: Dry every component

Moisture is the enemy of stored pool equipment. Water left inside a robotic cleaner can freeze and crack the housing or damage the motor. Water left in a hose can grow algae or mildew. Water in a power supply or charging contacts can cause corrosion.

After rinsing, shake off excess water and let the cleaner sit in a shaded, well-ventilated area for at least 24 hours. Open the debris canister or bag compartment so air can circulate. If your cleaner has a filter cartridge or bag, store it separately once dry. Leave the power cord or cable coiled loosely, not tightly wrapped, to avoid kinks.

Step 3: Battery care for robotic and cordless cleaners

Battery care is the most important part of storing a cordless or robotic pool cleaner. The chemistry of lithium-ion batteries, which power most modern cordless pool cleaners, degrades fastest when stored fully charged or fully empty. A battery stored at very low charge can drop to a voltage where it will no longer accept a charge, while a battery stored at 100% charge in a warm room can lose capacity faster over time. For more on battery management, see pool cleaner battery life and charging.

Manufacturer guidance varies, so the safest approach is to check your cleaner's manual. Many makers recommend storing the battery at around 50% charge, then topping it up in the spring before first use. If your cleaner has a removable battery, take it out and store it indoors, away from freezing temperatures. If the battery is built in, store the whole unit in a place that stays cool and dry, and plan to recharge it before the next season.

Never store a robotic cleaner in a pool over the winter, even if it is designed to stay in the water during the season. Freezing water can damage the seals, impeller, and battery compartment. If you have a caddy or docking station, store the cleaner on it, off the floor, so no moisture sits under the unit. See pool cleaner caddy and storage for storage accessories.

Step 4: Suction and pressure cleaner storage

Suction-side cleaners connect to the pool's skimmer or a dedicated vacuum line, and pressure-side cleaners connect to a booster pump. For both types, the off-season routine starts with disconnecting the cleaner from the hose and from the wall fitting or skimmer plate. Follow the manufacturer's instructions for your specific connection type, since suction and pressure fittings differ.

Drain the hose completely. A hose full of water can freeze and crack, or the water can sit stagnant and grow algae. Coil the hose loosely and store it flat or hanging, away from direct sunlight. The cleaner head itself should be rinsed, dried, and stored in a location where it will not freeze.

If your pressure-side cleaner has a sweep hose or a regulator valve, check that these are free of debris and move freely before storage. For suction-side cleaners, inspect the diaphragm or turbine and the brushes; remove any tangled hair or string that could harden and jam the mechanism. For more on choosing and maintaining these types, see best suction-side pool cleaners and best pressure-side pool cleaners.

Step 5: Choose the right storage location

A garage, shed, or basement that stays above freezing is ideal for storing a pool cleaner. If you must store it in an unheated space, bring the battery and any electronic components indoors. The PHTA guidance and most manufacturer manuals agree that freezing temperatures are a primary cause of off-season equipment failure.

Keep the cleaner off concrete floors if possible. Concrete can wick moisture, and cold transfers quickly through it. A shelf, a piece of cardboard, or a plastic bin under the cleaner helps. Do not stack heavy items on top of the cleaner, as this can deform the housing or brushes.

Store the power supply or transformer in a dry place, not on the floor. Coil the power cord with a loose loop and secure it with a twist tie, never a tight cable wrap. If you keep the original box, it makes an excellent storage container and protects the cleaner from dust and impact.

Bringing it back in the spring

When the pool opens again, before you run the cleaner, inspect the unit. Check the power cord for cracks, the brushes or tracks for damage, and the filter for any debris you missed. Charge the battery fully if it is a cordless model, or reconnect the power supply and run a short cycle in the pool to confirm the cleaner moves and picks up properly. If you run into issues, consult the pool cleaner troubleshooting guide.

A little time spent on storage now will save you from buying parts or a new unit next season. A cleaner that is cleaned, dried, and stored correctly will typically last longer than one that is left to freeze or sit in debris. If you are replacing a cleaner that wore out after poor storage, take the storing steps above as the baseline for the new one.

What to pick for your use

Questions

Can I leave my robotic pool cleaner in the pool over winter?

No. If the water temperature drops to freezing, ice can crack the housing, damage seals, and ruin the battery. Always remove the cleaner from the pool before the water freezes. See winterizing pool cleaner for more.

Should I store the battery fully charged?

Most lithium-ion batteries last longest when stored at around 50% charge. Check your manual for the specific recommendation, since some makers direct a different level. Never store a battery fully empty, as it may not recover. More details in battery life and charging.

Can I store my suction-side cleaner with the hose attached?

You can, but it is not the best practice. Water left inside the hose can freeze or grow algae, and the weight of the coiled hose can deform the cleaner head. Drain the hose and store parts separately.

Where should I store my pool cleaner in the winter?

Store it in a dry place that stays above freezing, like a garage, shed, or basement. Keep it off the concrete floor and store the battery indoors if it is removable. Consider using a caddy for proper support.