Brondell H2O+ Coral Single-Stage Carbon Block Replacement Water Filter (UF-15) Replacement filter for the Coral Single-Stage UC100 under counter water filtration system Reduces harmful Chloramine, Cysts, Mercury, Lead, MTBE, Asbestos, Turbidity, Class I Particulates, and VOCs Six month filter life (300 gallon capacity) for the UC100 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