Cartridge Filter
A cartridge filter is a pool filter type that uses a pleated polyester element to capture particles as water passes from outside to inside the element.
Definition
A cartridge filter is a pool filter type that uses a pleated polyester element to capture particles as water passes from outside to inside the element.
Typical Values: Filtration fineness: 10–15 microns; Clean when pressure rises 8–10 psi above baseline
In Plain Language
Cartridge filters capture particles down to 10–15 microns — finer than sand filters (20–40 microns). They require no backwashing (saving water) but need regular rinsing and periodic degreaser soaking. Cartridges are replaced annually or when they no longer return to baseline pressure after cleaning.
Why It Matters
Cartridge filters produce clearer water than sand filters and are especially appropriate in water-restricted areas since they require no backwash water.
Typical Values
Filtration fineness: 10–15 microns; Clean when pressure rises 8–10 psi above baseline
Last reviewed: 2026-06-01