Filter 2. Reduces 24 contaminants, including pharmaceuticals, waterborne parasites, lead, pesticides, asbestos and industrial chemicals NSF (National Sanitation Foundation) certified. Certified to fit these leading brands: Whirlpool, Maytag, KitchenAid, Jenn-Air and Amana. Used in bottom freezer refrigerators. Filter compartment is in the top right corner. Replace filter every 6 months or 200 gallons to maximize contaminant reduction.