... standard 3.used for cosmetic, pharmacy, chemical industries, foodstuff, drinking water. 4.1 year guantee ro water treatment system Use:Cosmetic, pharmacy ... when no water, Auto backwash, IC microcomputer control system, auto backwash RO fil, raw water and well water conductivity is ... (zwitterions exchange column) outlet electrical conductivity is within 0.1-1.0us/cm reaches to ultra-pure standard. ...