... purifying water treatment equipment ,with high quality, maded with reverse osmosis membranes . The FRO Automaticly purifying water treatment equipment ... is maded with reverse osmosis membranes,it has the characteristic as follows:1) ... water conductivityRemarkRO-5000.50.7550 10 400Ro500-A is reverse osmosis mixed bed RO-500A0.5A2.2500.1-1 ...