Complete Guide · 6 articles
Pool Cartridge Filter Guide — How to Clean, When to Replace
Cartridge filters offer finer filtration than sand (down to 10–15 microns) with lower water waste — no backwashing means no hundreds of gallons of water down the drain each week. The trade-off is more hands-on cleaning. This guide covers the correct cleaning technique, replacement schedules, and how to choose the right size for your pool.
Pool Filter Guide Editorial Team
4 FAQs answered
Updated 2025-04-14
All Guides in This Section
6 articles How-To 01
How to Clean a Pool Cartridge Filter Hose rinse vs chemical soak - the right method for each situation.
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Guide 02
How Often to Clean Pool Cartridge Filter The PSI-based cleaning schedule - not weekly, not monthly.
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Guide 03
When to Replace a Pool Cartridge Filter 5 signs the cartridge is past cleaning and needs replacing.
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How-To 04
How to Vacuum a Pool with a Cartridge Filter No WASTE setting on cartridge filters - here is the correct technique for routine and post-algae vacuuming.
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Review 05
Best Pool Cartridge Filter Pentair vs Hayward - quad cartridge filters ranked by filter area, cleaning ease, and build quality.
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Review 06
Best Pool Cartridge Filter Cleaner Tested: enzyme cleaners vs acid-based - which removes oils best.
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Frequently Asked Questions
How do you clean a pool cartridge filter?
To clean a pool cartridge filter: (1) Turn off the pump and release pressure via the air relief valve. (2) Remove the filter lid and lift out the cartridge(s). (3) Rinse with a garden hose at a 45-degree angle from top to bottom, working between the pleats. Do not use a pressure washer — it damages the pleats. (4) For a deep clean, soak overnight in a filter cleaning solution diluted in water. (5) Rinse clean, reinstall, and start the pump. Clean the air relief until water flows, then close it.
How often should you clean a pool cartridge filter?
Clean when your filter pressure gauge reads 8–10 PSI above the clean baseline. For an average residential pool, this typically means every 2–6 weeks in summer. Heavily used pools, pools in wooded areas, or pools that recently had an algae bloom may need cleaning every 1–2 weeks.
Do you backwash a cartridge filter?
No. Cartridge filters do not have a backwash valve. They are cleaned by removing the cartridge and hosing it down or soaking it in cleaning solution. Some pool owners confuse "cartridge filter" with the filter basket on their pump — that basket is cleaned separately and does not affect the cartridge.
How long does a pool cartridge filter last?
A pool cartridge filter element typically lasts 2–5 years with proper maintenance. Signs it needs replacing: pleats are visibly cracked or crushed, cleaning no longer brings pressure back to baseline, or the cartridge has a permanent grey or brown discoloration that does not wash out. Cheap replacement cartridges from off-brand suppliers often last under 1 year.