How to Store Your Pool Cleaner for Winter

Why winter storage matters

Pool cleaners work in a wet, chemically treated environment. When the swimming season ends, leaving the cleaner in the water or exposed to freezing temperatures can damage seals, crack plastic housings, and shorten the life of motors and batteries. Proper winterization protects your investment and ensures the cleaner operates reliably when you open the pool next year.

The Pool & Hot Tub Alliance (PHTA) develops national standards for safe pool operation and maintenance, and while their standards focus on water quality and construction, the general principle of protecting equipment from harsh conditions is a best practice recognized across the industry. For example, a cleaner left with water inside can freeze, expand, and break internal components. Similarly, a robotic cleaner's battery may lose capacity if stored in extreme cold or fully discharged for months.

Whether you have a robotic pool cleaner, a suction side model, or a pressure side unit, the storage steps are similar in spirit: remove, clean, dry, and shelter. The differences come down to the extra components like hoses, booster pumps, and power supplies.

Step 1: Remove and rinse the cleaner

Start by lifting the cleaner out of the pool. For robotic units, use the cable to pull it to the edge, then lift carefully to avoid straining the cable connection. For suction or pressure side cleaners, disconnect the hose from the skimmer or dedicated line and pull the unit up gradually so water drains from the hose as you go.

Once out, rinse the outside with a garden hose to remove chlorine, salt, and debris. Pay attention to brushes, wheels, and the intake area. This initial rinse prevents dried-on material from clogging the cleaning mechanism later.

If your cleaner is a wall-climbing model, inspect the tracks or wheels for stones or twigs that could have been picked up during the last cycle. Remove any visible debris by hand before the next steps.

Step 2: Drain all water

Water left inside the cleaner is the biggest risk in freezing climates. For robotic cleaners, tilt the unit to let water flow out of the filter compartment and any internal channels. Many models have a drain plug or an open filter lid that helps. Shake gently to dislodge trapped water.

For suction side and pressure side cleaners, the hoses hold a significant amount of water. Disconnect each section and hold it vertically to let the water run out. Lay the hoses flat on a slope so they can completely drain. Some hoses have ribs that retain water; turning them slightly can help release it.

Do not use compressed air to force water out unless the manufacturer explicitly recommends it. High-pressure air can damage seals or create tiny cracks. Gravity is the safest method.

Step 3: Clean the filter, brushes, and hoses

After draining, remove the filter cartridge or bag. Rinse it with a hose until the water runs clear, then spray with a mild detergent if needed. Let the filter air dry completely before storage. A filter that is put away damp can grow mold and create odors.

Brushes and scrubber pads should also be cleaned. Use a soft brush or a cloth to remove hair, oil, and fine debris. If your cleaner has a self-cleaning filter, consult the manual for the recommended cleaning procedure. The pool cleaner filter types guide explains the different filter media and how to maintain them.

For suction and pressure units, inspect the hose sections for cracks or leaks. Check the swivel fittings and O-rings. O-rings can be lightly lubricated with a silicone-based pool lubricant, but do not use petroleum jelly as it can deteriorate rubber.

Step 4: Dry everything completely

After cleaning, place all components in a shaded, well-ventilated area. Avoid direct sunlight because UV rays can degrade plastic and rubber. Allow the cleaner, hoses, and filters to sit for at least 24 hours. If you are in a humid climate, wipe down surfaces with a dry cloth before storage.

Pay special attention to the inside of robotic cleaners. Open every access panel, remove the filter basket, and prop the lid open so air can circulate. The goal is to eliminate any trapped moisture that could freeze or promote corrosion.

For cordless robotic models, the battery is a critical component. Read the battery life and charging article to understand optimal storage charge. Most lithium-ion batteries should be stored at about 40% to 60% charge in a cool environment, but always follow the manufacturer's specific instruction.

Step 5: Store in a dry, cool place

The best storage location is a garage, basement, shed, or closet where the temperature stays above freezing. Avoid attics or areas that get very hot in summer. Consistent, moderate temperatures protect seals and plastics.

Place the cleaner on a mat or a piece of cardboard. Do not hang it by the cable or put heavy items on top. If storing on a hard floor, consider turning the robot upside down so the brushes do not deform under their own weight.

Hoses should be coiled loosely without sharp kinks. Use a cable reel or a large-diameter loop. For robotic cables, wind them in a figure-eight pattern to prevent memory curls that can tangle during use.

Step 6: Protect cables and power supplies

The power supply for a robotic cleaner is a sensitive electronic component. Store it indoors in a dry location, away from water and direct heat. Never leave the power supply plugged in during the off-season; unplug it to avoid standby power draw and potential surge damage.

Inspect the cable for nicks or exposed wires. If you find damage, address it before next season. Keep the connector ends dry and protected with caps if provided. For suction and pressure side cleaners, the booster pump (if separate) should also be winterized. Review the pump care advice from ENERGY STAR, which notes that variable-speed pumps use less energy and often have better durability, but the same cold-weather precautions apply.

Step 7: Check manufacturer instructions

Your cleaner's manual is the final authority. Modern robotic cleaners from brands like Maytronics and Aiper have specific storage procedures. Some recommend storing the unit on its side; others require a full charge cycle before storage. Always verify the manual for your exact model.

If you no longer have the paper manual, manufacturers publish PDFs and FAQ pages online. Search for the model number and 'winter storage.' You can also check the troubleshooting article for common issues that arise from improper storage.

Step 8: Prepare for spring

When the pool opens in spring, take the cleaner out of storage and perform a basic check. Reinstall the filter, reconnect hoses, and charge the battery if applicable. Run the cleaner in the pool for a short cycle to verify it operates correctly. If you notice reduced performance, refer to the replacement parts guide.

By following these steps, you can extend the life of your cleaner and avoid mid-season breakdowns. For more guidance on choosing a cleaner that fits your pool and maintenance routine, explore our best robotic pool cleaners and best suction side pool cleaners guides.

What to pick for your storage situation

Questions

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

It is not recommended. Pool chemicals and cold water can degrade seals and plastic over months. Even if the pool is not drained, the cleaner may sink or be damaged by freezing if water gets inside. Always remove and store it dry.

Should I store my pool cleaner indoors or outdoors?

Indoors is always better. A garage, basement, or closet that stays above freezing protects the cleaner from temperature swings and UV rays. If you must keep it outdoors, use a weatherproof container, but moisture can still condense inside.

How do I prevent freezing damage in a robotic cleaner?

Make sure every part is completely dry before storage. Drain the filter chamber, open all access doors, and let the unit air out for at least 24 hours. If the manual allows, store it with the lid open to promote airflow.

Can I use antifreeze in the pool cleaner to prevent freezing?

No. Most pool cleaners are not designed for antifreeze. Propylene glycol can interfere with seals and leave residues that affect water chemistry. The correct approach is to drain all water and store the cleaner in a frost-free area.

What should I do with the power supply for a robotic cleaner?

Unplug it, disconnect the cable from the power box, and store the power supply in a dry indoor area. Coil the cable loosely and avoid bending it sharply. Do not leave the power supply plugged in during the off-season.