InSinkErator F-1000 Replacement Water Filter, 1-Pack of Under Sink Water Filter Cartridge for Water Filtration Kit One replacement water filter for use with InSinkErator water filtration system Replacement water filter reduces chlorine taste and order and other particulates down to 5 micron for clean, great-tasting water Sanitary, quick-change filter cartridge and twist-and-lock design for easy filter changes Recommended to replace water filter every 6 months for optimal performance Compatible with InSinkErator F-1000S and F-2000S filtration system only; not for use with InSinkErator SST-FLTR stainless steel tank and filtration system