A cartridge filter is a key component of your pool’s filtration system. It captures dirt, debris, and fine particles to keep your water clean and clear. Regular cleaning of your cartridge filter improves filtration efficiency, reduces strain on your pump, and extends the lifespan of your equipment.
In this guide, learn when, why, and how to clean a pool cartridge filter properly.
When Should You Clean a Cartridge Filter?
You should clean your cartridge filter when the pressure gauge rises 5 to 10 PSI above the normal operating pressure.
👉 The normal pressure should be recorded right after a full cleaning, when the system is running optimally.
Additional signs:
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Reduced water flow at return jets
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Cloudy or less clear water
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Weak circulation
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Longer pump run times
Cartridge Filter Lifespan
A cartridge typically lasts 3 to 5 years, depending on usage and maintenance.
Regular cleaning helps:
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maintain optimal filtration performance
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prevent premature wear
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extend the life of the cartridge
Why Is Regular Cartridge Filter Cleaning Important?
A dirty filter can:
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reduce filtration efficiency
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increase system pressure
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strain the pool pump
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increase energy consumption
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lead to cloudy water
👉 Proper maintenance helps keep your pool water crystal clear and protects your equipment.
How to Clean a Cartridge Filter (Step-by-Step)
1. Turn Off the Pump
Always shut off the pump before performing any maintenance.
2. Isolate the System
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Close the 3-way valve under the skimmer
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Close the valve between the filter and return line (if installed)
3. Drain the Filter
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Open the air relief valve on top
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Unscrew the drain plug at the bottom
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Let all the water drain completely
4. Open the Filter
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Remove the top lid
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Take out the cartridge
👉 Inspect the cartridge for damage (tears, cracks, deformation).
5. Clean the Cartridge
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Use a garden hose (never a pressure washer)
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Spray at an angle
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Clean from the inside out to remove debris trapped in the pleats
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Use a specialized cleaning tool if available
⚠️ A pressure washer can damage the cartridge and shorten its lifespan.
For heavily soiled cartridges (oils, sunscreen, algae), use a cartridge cleaner product following manufacturer instructions.
6. Reassemble the System
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Reinstall the cartridge
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Lubricate the O-ring
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Close the filter housing
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Reinstall the drain plug
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Reopen all valves
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Leave the air relief valve open
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Restart the pump
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Close the air relief once water flows steadily (no air)
Cartridge Filter Maintenance Tips
To keep your filtration system running efficiently:
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Check pressure regularly
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Clean the cartridge at 5–10 PSI increase
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Handle the cartridge carefully
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Clean more often during heavy pool use
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Replace worn or damaged cartridges
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Use proper cleaning products when needed
Pro Tip for Better Filtration
Using a solar cover helps reduce debris entering the pool, which slows down cartridge clogging and reduces cleaning frequency.
Key Takeaway
Regular cartridge filter cleaning is essential for maintaining clear water, protecting your pool equipment, and ensuring efficient filtration. By monitoring pressure and following proper cleaning steps, you can keep your pool system running smoothly all season long.