Pentek C1 Carbon Filter Cartridge, 9-3/4" 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 polyester backing and netting for strength and dirt-holding capacity Initial pressure drop of 4 psi at a flow rate of 5 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)