Hydro-Logic Evolution RO1000 Membrane

Hydro-Logic® ChloraShield filters remove up to 100% of chloramine and are great for city water. HGC728686 [replaces HL 22018] is for BigBoy systems (20 in x 4.5 in) and should be replaced after 7,000 gallons purified. HGC741668 [replaces HL22022] is for TallBoy systems (20 in x 2.75 in) and should be replaced after 6,000 gallons filtered. HGC728772 [replaces HL 22019] is for Evolution-RO systems (20 in x 2.5 in) and should be replaced after 2,500 gallons purified. HGC741640 [replaces HL22020] is for PreEvolution systems (10 in x 4.5 in) and should be replaced after 7,500 gallons filtered. HGC741700 [replaces 22021] is for smallBoy/Stealth-RO systems (9.75 in x 2.75 in) and should be replaced after 1,500 gallons purified when used with Stealth-RO systems and 3,000 gallons filtered when used in smallBoy systems.