Cuno's new one cartridge IMPACTechnology system replaces conventional systems with up to three cartridges; Combines chlorine taste & odor reduction with cyst, bacteria & sediment reduction for up to 9,000 gallons; Built in scale inhibitor reduces calcium & magnesium buildup on evaporator plates as hard scale; .5 Micron rating; 1.5 GPM; 3/8" pipe size inlet and outlet; NSF certified