Hydrologic Pre-Evolution KDF/Catalytic Carbon Filter 10Are you finding the high end water filter for high capacity chloramine and chlorine reduction? This Pre Evolution filter is a good choice. This KDF catalytic carbon filter uses two additional filtration stages to reduce iron, hydrogen sulfide, and other volatile organic compounds (VOCs) from the water. You can use this high capacity dechlorination system for your city or well water. We recommend you replace the filter after 7500 gallons of use.