Pentek PD-25-20 Polypropylene Filter Cartridge, 20" x 2-1/2", 25 Microns Reduces sand, silt, scale, and rust particles in commercial drinking water and industrial fluid applications Nominal filtration rating of 25 microns Bonded polypropylene microfiber for resistance to chemicals and bacteria Initial pressure drop of less than 2 psi at a flow rate of 5 gpm Temperature range of 40 to 175 degrees F (4.4 to 79.4 degrees C)