Pentek GAC-BB Drinking Water Filter (9-3/4" x 4-1/2") Filter cartridge for reduction of chlorine taste and odor and other unwanted tastes and odors Built-in 20-micron post filter for reduction of carbon fines and other suspended particles Granular activated carbon filter medium inside a polystyrene housing Initial pressure drop of 6 psi at 2 gpm Temperature range of 40 to 125 degrees F (4.4 to 51.7 degrees C)