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Hydro-Logic Chlorashield membranes remove 100% of chloramine and are great for city water. Rated at 1 GPM down to 1 micron. They are made inch the USA and have a low pressure drop combined with exceptionally high dirt holding capacity. HGC728772 is for Evolution-RO systems 20x2.5 in and should be replaced after 2,500 gallons. HGC741668 is for TallBoy systems 20x2.75 in and should be replaced after 6,000 gallons. HGC741640 is for PreEvolution systems 10x4.5 in and should be replaced after 7,500 gallons. HGC741700 is for smallBoy/Stealth-RO systems 9.75x2.75 in and should be replaced after 1,500 gallons when used with Stealth-RO systems and 3,000 gallons when used inch smallBoy systems.
