Pentek C2 Carbon-Impregnated Cellulose Filter Cartridge, 4-7/8" x 2-1/2", 5 Micron Reduces fine sediment and chlorine taste and odor in residential drinking water Nominal filtration rating of 5 microns Carbon-impregnated cellulose media with a polyester backing and external polyethylene netting for strength Initial pressure drop of 2 psi at a flow rate of 2 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)