Replacement Water Filter Compatible with F-1000, Sub Zero 4204490, Insinkerator F-1000 (1Pack) 1. Compatible with InSinkErator F-1000, InSinkErator F1000, Sub Zero 4204490 2. USAGE-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 3. BENEFIT-Tastes great by leaving potentially healthy, beneficial minerals while removing chlorine, other chemicals and contaminants 4. MATERIAL-High grade carbon block, that removes over 99% of numerous potentially harmful contaminants which may be present in the water 5. Easy installation with clear instructions.