Craft Brew Water's 1" x 3cf Cat Carbon System is designed to eliminate Chloramines, Chlorine and a number of other chemicals that may be present in your brewing water. Max Flow rate is 15 GPM. We use the finest Catalytic Carbon on the market today and carries the NSF seal. We never blend, and our systems are ready for installation. We are proud to say that our tanks and valves are made in the USA and the system is Proudly built in the USA.