COMES WITH THE FOLLOWING: 5 TO 6 STAGE WATER FILTRATION SYSTEM 1. STAGE SEDIMENT FILTER 5 MICRON 2ND STAGE CARBON BLOCK FILTER 5 MICRON 3RD STAGE GAC WATER FILTER 4 STAGE MEMBRANE 100 GPD 5 STAGE DI WATER FILTER OR INLINE ALKALINE FILTER GOES TO TUBE WITH STRAIGHT BALL VALVE.