Everpure EV9617-21 4CB5-S Filter Cartridge Reduces chlorine taste and odor and other offensive contaminants that can adversely affect the taste of water and beverages Reduces extra fine dirt and particles as small as 5 micron in size Reduces limescale build-up that can cause excessive machine downtime and increased maintenance costs Sanitary cartridge replacement is simple, quick and clean. Internal filter parts are never exposed to handling or contamination NSF Certified under NSF Standard 42