Domakihub How to Clean a Pool Filter Cartridge the Right Way
A simple, repeatable routine to restore flow, clarity, and chemical efficiency.
Reviewed by Domakihub pool pros · 2026-06-23 · 4 min read
A clogged cartridge is the most common reason a pool turns cloudy, loses circulation, and burns through chemicals. The video above walks through the hands-on process, and this guide lays out the steps clearly so you can follow along and clean yours with confidence. It is written for homes, holiday rentals, and hotels across Greece, where heavy summer use and fine Aegean dust mean filters fill up fast.
Why a clean cartridge matters
The cartridge is the heart of your filtration system. As water passes through its pleated fabric, it traps sunscreen oils, dust, pollen, and fine debris. Over a busy season those particles build up, water flow drops, and your pump has to work harder for a worse result.
A dirty cartridge does not just cloud the water. It wastes chlorine, strains the pump motor, and can mask bigger problems. For rentals and hotels, that translates directly into guest complaints and higher running costs, so a quick clean every few weeks pays for itself.
When and how often to clean
A reliable signal is your pressure gauge: when it climbs about 8 to 10 psi above the clean baseline, it is time. In practice, a residential pool benefits from a rinse every two to four weeks in summer, while a high-traffic rental or hotel pool may need it weekly.
Plan for a deeper soak-clean a few times per season to dissolve oils and scale that a simple hose-down cannot remove. Most cartridges last one to three seasons; replace yours when the pleats are torn, the end caps are cracked, or it no longer clears the water after a proper clean.
Step-by-step: cleaning your cartridge
- 1
Power down and depressurise
Switch off the pump at the timer or breaker so it cannot restart while you work. Open the air relief valve on top of the filter tank to release pressure, then close the skimmer and return valves if your system has them. Never open a filter tank under pressure.
- 2
Open the tank and remove the cartridge
Unclamp or unscrew the filter housing and lift off the top. Carefully pull out the cartridge, noting how it sits so you can refit it the same way. Tip out any debris caught in the bottom of the tank and inspect the cartridge for tears, flattened pleats, or cracked caps.
- 3
Rinse off the loose debris
Hose the cartridge from top to bottom with a firm spray, holding the nozzle at an angle to push dirt out of each pleat. Work all the way around. Spreading the pleats gently with your fingers helps flush out the grit trapped deep inside the fabric.
- 4
Soak to remove oils and scale
For anything beyond a light rinse, submerge the cartridge in a bucket or bin filled with a dedicated filter cleaner diluted in water, and let it soak for several hours or overnight. This dissolves the sunscreen oils, body lotion, and mineral scale that a hose alone leaves behind. Avoid household bleach, which damages the fabric.
- 5
Final rinse, dry, and reassemble
Rinse the cartridge thoroughly until the water runs clear and no cleaner remains. Where time allows, let it dry in the shade so trapped oils harden and rinse away easily next time. Refit the cartridge, replace any worn O-ring with a smear of silicone lubricant, close the tank, reopen the valves, then restart the pump and bleed the air until water flows from the relief valve.
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FAQ
- How often should I clean my pool filter cartridge?
- Use the pressure gauge as your guide and clean when it reads about 8 to 10 psi above the clean baseline. In a Greek summer that usually means every two to four weeks for a home pool, and as often as weekly for busy rental or hotel pools. Add a deeper soak-clean a few times each season.
- Can I just hose it off, or do I need to soak it?
- A hose rinse handles dust and loose debris and is fine for routine cleaning. But oils from sunscreen and lotion, plus mineral scale, cling to the fabric and only a soak in a proper filter cleaner removes them. Skipping the soak lets the cartridge clog faster and clear the water less effectively over time.
- When should I replace the cartridge instead of cleaning it?
- Replace it when the pleats are torn or permanently flattened, the end caps are cracked, or the water stays cloudy even after a thorough soak and rinse. Most cartridges last one to three seasons depending on use, so heavy-traffic rental and hotel pools will go through them faster.