Clean pool filter

Clean your pool filter to maintain clear water and efficient circulation.

Why it matters#

A dirty filter restricts water flow, reduces filtration effectiveness, and makes your pump work harder. Regular cleaning keeps your pool clear and equipment running efficiently.

What you'll need#

Tools#

Garden hose with spray nozzle
Filter wrench (for cartridge housing)

Materials#

Filter cleaner solution (for cartridge or DE filters)
Diatomaceous earth (for DE filters, if recharging)
Replacement cartridge (if old one is worn)

Steps#

1. Turn off the pump#

Always shut off the pool pump before opening the filter housing.

2. Release pressure#

Open the air relief valve on top of the filter tank to release pressure.

3. Remove the filter housing lid#

Unclamp or unscrew the lid. Remove the cartridge(s) from inside.

4. Rinse with hose#

Use a garden hose with a spray nozzle to rinse each pleat, working from top to bottom. Rotate the cartridge as you spray.

5. Soak in filter cleaner (if needed)#

For deep cleaning, soak the cartridge in filter cleaner solution diluted per product instructions. Let it sit for the recommended time (often overnight).

6. Rinse thoroughly#

Rinse all cleaner solution from the cartridge. Let it dry before reinstalling if you have a spare to use in the meantime.

7. Reassemble and restart#

Place the cartridge back, secure the lid, and restart the pump. Open the air relief valve until water sprays out, then close it.

Pro tips#

Clean cartridge filters every 2-4 weeks during swim season; backwash sand/DE filters when pressure rises 8-10 PSI above clean
Keep a spare cartridge so you can rotate while one dries
Cartridge filters last 2-3 years with proper cleaning; sand needs replacement every 5-7 years
High filter pressure means it's time to clean; low pressure may indicate a suction problem

Warnings#

Always turn off the pump and release pressure before opening the filter
DE powder is a fine dust—wear a mask when handling to avoid inhalation
Never run the pump with the filter housing open or improperly sealed

If filter pressure remains high after cleaning, or you notice DE or sand in the pool (indicating a broken internal component), call a pool service technician. Filter repairs or media replacement can be DIY but may be easier left to professionals.