The OptimH2O® Reverse Osmosis + Claryum® Carbon and Claryum® Filter Replacements set replaces the Carbon (Stage 1) and Claryum® (Stage 3) of the OptimH2O® Reverse Osmosis + Claryum® (AQ-RO-3.55/56/62) and lasts for 365 gallons or up to 6 months. These replacement filters are WQA tested and certified to NSF/ANSI Standards 42, 53 (includes P473), and 401 to reduce 95% of mercury, 97% of chlorine and arsenic, and 99% of microplastics, lead, and asbestos. Paired with the RO Membrane in the OptimH2O® Reverse Osmosis + Claryum®, these filters effectively remove up to 99% of 89 contaminants, including fluoride. In all, the OptimH2O® Reverse Osmosis + Claryum® removes 5X more contaminants than other RO systems, while maintaining the benefits of health minerals other reverse osmosis systems remove. Filter replacements are engineered for the easiest replacement. No need to disconnect hoses or water lines - simply twist off and replace.