Compatible with F-1000S and F-2000S Water Filtration Systems only, Automatically shuts water off when filter cartridge is replaced, Reduces particulates, chlorine taste and odor, or clean-tasting water, NSF standard 42 certified for quality assurance, Recommended 6 months replacement for optimal performance, Includes one replacement filter only, Twist-and-lock design for quick-and-easy filter changes, Sanitary quick-change filter cartridge