12 PACK Pentek P25 Sediment Filter Cartridge 25 Micron size 2″x10″ (155015-43). That is used for reducing sediment in water, is a premium 25-micron sediment depth filter cartridge offering long filter runs and high dirt holding capacity for residential and industrial applications. 3/4″ X 2.5″ or know as 10″ x 2.5″. Filter Life: 6 months. Application : City or well water. Reduction: Sediment (sand, dirt, silt, rust, and scale particles).