... (electric conductivity≥15MΩ.CM)2.Pre-treatment +double stage reverse osmosis system+EDI(electric conductivity≥15MΩ.CM)3.Pre-treatment ... +double stage reverse osmosis system +air film+EDI+polishing mixed bed(electric ... standard water,water storage easy to pollution; 4.Adopted import reverse osmosis membranes,desalination rater is high ,long service life, ...