INSINKERATOR F-3000 REPLACEMENT WATER FILTER CARTRIDGE: 11.75-inch by 2.25-inch F-3000 PFOS/PFOA filter for water with 500-gallon capacity; compatible with F-3000S, F-2000S, and F-1000S water filter systems BRAND'S HIGHEST-LEVEL FILTRATION: Under sink water filter replacement cartridge that reduces more than 70 contaminants, including PFOA/PFOS chemicals, lead, VOCs, DEET, ibuprofen, naproxen, asbestos, cysts, mercury, and other harmful impurities EASY DIY FILTER CHANGE: Drinking water filter to use with water filter system (sold separately) featuring quick-connect fitting and twist-and-lock design for fast and easy filter changes, automatically shutting off water flow during filter replacement LONG-LASTING FILTERS: Replacement of water filter every six months at rated capacity recommended for optimal performance of water filter system, or sooner if a noticeable reduction in flow-rate occurs "Subscribe and Save" program including convenient replacement reminders available for INSINKERATOR drinking water filter cartridge replacement