Replacement Water Filter Compatible with F-1000, Sub Zero 4204490, Insinkerator F-1000 (2Pack) Compatible with InSinkErator F-1000, InSinkErator F1000, Sub Zero 4204490 Easy installation with clear instructions. High grade carbon block, that removes over 99% of numerous potentially harmful contaminants which may be present in the water Tastes great by leaving potentially healthy, beneficial minerals while removing chlorine, other chemicals and contaminants Six-month filter life: For best filtration results, filter cartridge should be replaced every six months or 300 gallons. Tested and certified by a non-governmental organization dedicated to public health, safety, and environmental protection