Everpure's unique filter blend using activated carbon reduces chlorine taste, odor and other contaminants.Precoat submicron technology reduces dirt and particles as small as 1/2 micron in size.Reduces possible health contaminants such as asbestos fibers and Cryptosporidium and Giardia cystsSanitary cartridge replacement is simple, quick and clean. NSF certified under 42 and 53