Pentek ChlorPlus 10 Carbon Block Filter Cartridge, 10" x 2-1/2", 1 Micron Reduces chlorine and chloramines in residential and commercial drinking water Nominal filtration rating of 1 micron Bonded PAC media with a polyolefin core and shell Initial pressure drop of 6 psi at a flow rate of 1 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)