Pentek NCP-20BB Pleated Carbon-Impregnated Polyester Filter Cartridge, 20" x 4-1/2", 10 Microns Reduces sediment and chlorine taste and odor in residential and municipal drinking water Nominal filtration rating of 10 microns Carbon-impregnated polyester media pleated around a polypropylene core for strength and resistance to bacteria Initial pressure drop of 1 psi at a flow rate of 10 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)