... pharmaceutical, chemical industry, also suitable for manufacture potable wa reverse osmosis water treament advantage:1,the systerm occupy little space, easy ... cost is also low. 3,finshed water under good electric conductivity ,one stage ≤ 10us/cm,two stage around ... , activated carbon, pp sediment membranes(precision filter) and reverse osmosis membranes, we can use Hydranuatic brand or Dow Filmtec ...