Aqua Blue 3US-AF01 Water Filter Replacement For Filtrate 3US-AF01 Undersink NSF Certified SAME QUALITY as the original for half the price NSF certified to filter contaminants such as cysts, lead, mercury, asbestos, and select pesticides and chemicals 6 MONTH filter life (cartridge should be replaced every 6 months at a rated capacity REPLACEMENT MODEL: 3M Filtrate 3US-PF01, 3US-MAX-F01H, 3US-PF01H Filter Cartridge; Fits 3US-PS01 Advanced Faucet Water Filtration Systems 100% SATISFACTION Guarantee. If you are not completely satisfied, with your filter will be replaced or your purchase price refunded.