Made from pleated cellulose media, the ECP1-BB Pentek Big Blue Filter Cartridge is a superior quality water filter cartridge that reduces sand, dirt, silt, rust, and scale particles in residential and commercial water. It features high dirt holding capacity, high flow rates while maintaining very low pressure drop. Featuring nominal filtration rating of 1 micron and temperature rating of 40?F to 125?F, this water sediment filter is well-suited for general water filtration purposes. It has initial pressure drop of less than 1 psi at a flow rate of 20 gpm i.e. <0.1 bar @ 76 L/min. This 9-3/4" x 4-1/2" (248 mm x 114 mm) ECP1-BB is recommended for rust filtration, sediment filtration and various applications, on both city and well water.