Camco 40620 EVO Premium Replacement Water Filter Cartridge Filtration begins with water traveling through a porous shell with openings no greater than 5 microns in diameter Filtered water then passes through a bed of KDF and GAC (Granulated Activated Carbon) for further filtration and bacteria control Contains premium carbon with a high microporosity level for absorbing harmful VOCs (Volatile Organic Compounds) Designed as a premium replacement cartridge for Camco's Evo Water Filter housing