Pentek GAC-5 Carbon Filter Cartridge, 4-7/8" x 2-7/8" Reduces chlorine taste and odor in residential and commercial drinking water 20-micron post filter helps reduce carbon fines and other particles GAC media with polystyrene outer casing and end caps for strength Initial pressure drop of 3.0 psi at a flow rate of 0.5 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)