Standard 10"" C.T.O. Prefilter. Removes free chlorine and organic chemicals.
Compatible as a substitute for following pre filters: Watts Premier 5 Micron Carbon Block filter, Omni CB1, Teledyne WaterPik IR-70, Sears 3480, American Plumber W-30 / American Plumber W.5CB, Ace Hardware 4158721, MasterPlumber TrueValue 529-324, Flotec TO3, GE FXULC,