... , chemical industry, also suitable for manufacture potable wa reverse osmosis water treament advantage:1,the systerm occupy little space, easy ... addition, is operation cost is also low. 3,finshed water under good electric conductivity ,one stage ≤ 10us/cm,two ... (4) source water is to be filted by quartz sand, activated carbon, pp sediment membranes(precision filter) and reverse osmosis membranes, we ...