Cartridge Pool Filters

Match the filter's flow rate (gallons per minute or GPM) and recommended pool volume to your pump and pool size; choose a cartridge with enough filter area to handle the pool turnover rate (typically 8–12 hours per full turnover). Check the filter's maximum flow rating and compare to your pump's flow at the system head loss, and select a cartridge model specified for your pool type (above-ground vs in-ground) and plumbing dimensions

Cartridge filters use pleated fabric media to capture particles down to roughly 10–15 microns, offering higher dirt-holding capacity and lower backwash water usage than sand filters, but they typically require periodic removal and rinsing rather than backwashing. Diatomaceous earth (DE) filters capture smaller particles (around 3–5 microns) but involve handling powder and more maintenance steps

Rinse cartridges with a hose every 1–4 weeks depending on bather load and debris, deep-clean with a filter cleaner or soak every 3 months or when pressure rises 6–8 psi above clean-start pressure, and replace cartridges every 1–3 years depending on usage, chemical exposure, and physical wear

Look for cartridges made from durable polyester or similar pleated media with corrosion-resistant end caps and sturdy core construction; verify cartridge dimensions, tank model compatibility, and O-ring conditions to ensure a proper seal and fit with your existing filter housing and plumbing

Cartridge filters and replacement elements span a price range from budget options under $50 for simple replacements to higher-end or OEM-style cartridges and complete filter systems that cost more; overall average prices for products in this category are around $80, with long-term costs affected by replacement frequency and cleaning supplies

Yes — use manufacturer-recommended filter cleaners or a diluted muriatic-free detergent solution for deep cleaning; avoid harsh chemicals that can degrade the pleated media or rubber parts, and thoroughly rinse and fully dry cartridges before reinstallation if indicated by the cleaner instructions

Replace the cartridge if the pleats are torn, flattened, permanently stained, or if pressure does not return to normal after thorough cleaning and reinstallation; repeated need for frequent cleaning, visible media deterioration, or fouled inner cores are signs replacement is required