5.25″ × 9.875″ Replacement Filter Cartridges

Every cartridge in our index that measures 5.25″ across by 9.875″ tall, all 1 of them. Compare brands side by side and cross-reference the Pleatco, Unicel, and Filbur numbers before you order.

One catch: diameter and length are the dimensions that get most of the attention, but end-cap style (open, closed, or with a hole) has to match the housing too. A cartridge that's technically the right size won't seal if the cap is wrong, so check both before you buy. Here's how to measure a cartridge.

Close sizes: 5.25″ × 12.1875″ · 5.1875″ × 11.875″ · 5.1875″ × 11.9375″ · 5.1875″ × 12.5″ · 5.1875″ × 14.125″ · 5.1875″ × 14.75″ · 5.1875″ × 19.625″ · 5.375″ × 8.5625″ · Browse all sizes →