One replacement filter for use with InSinkErator water filtration system * Reduces particulates, chlorine taste and odor, plus cysts, lead, mercury, and other impurities for clean tasting water * Sanitary, quick-change filter cartridge makes replacement easy; twist and lock design for quick, easy filter changes * Recommended 6 month replacement for optimal performance * Compatible with InSinkErator F-1000S & F-2000S filtration system only; not for use with InSinkErator SST-FLTR stainless steel tank & filtration system