1. 1st,UF Tube(0.01micron )- high quality fiber dressed cartridge.
Can separate all big impurities in the water such as but not limited to rust, sludge, sand, hair, mud & suspended microorganism
(Filter should be changed within 12 months, depending on the quality of the source water)

2. 2nd Tube(Resin water softening cartridge)—provides softened water in a convenient cartridge style design
By using bed of sodium form caution resin beads to reduce total dissolved solids TDS or hardness(ca/mg) and scale deposits. This design means that softened water is provided at point of use- either through under counter system or in a countertop model;