Brondell H2O+ Coral Three-Stage Carbon Block Replacement Water Filter Set (UF-35) Replacement filter for the Coral Three-Stage UC300 under counter water filtration system Reduces harmful Chloramine, Cysts, Mercury, Lead, MTBE, Asbestos, Turbidity, Class I Particulates, and VOCs Twelve month filter life (600 gallon capacity) for the UC300 system Double o-ring filter seal to prevent leaks & Twist & Seal filters make replacement a breeze Gold Seal certified by WQA (Water Quality Association) for trusted performance