Undersink reverse osmosis: 1.Standard 5 stage RO system 2.Food grade material ... :30%RO 5 stage systemFilter PP, GAC, CTO 50G CSM membrane 3.0G pressure storage tankStainless steel drinking water tap Carton ... ,odor ,and color.Stage 4:(RO)Reverse osmosis membrane ,thins film composite high quality membrand taht processes 50GPD,it remove:lead,cooper,barium,mercury ...