HyperLogic 20" BigBoy Anti-Scale filter cartridge. Helps prevent scale formation on RO membranes and prolongs equipment life downstream by transforming dissolved hardness into inactive particles. These particles will be rejected by the RO membrane in the Concentrate waste. Replace yearly. Continuous Service Flow of 4 GPM; 1- GPM Peak. Commonly used in our BigBoy housings, Dual or Triple Housing Prefiltration assemblies prior to our Commercial series RO systems. Single Use 4.5" x 20" Cartridge. Formerly HyperLogic HL 11632