... on reverse osmosis,with filter and softener,add mixed bed,EDI to high desalinization ratio,PLC programmable controller The ... osmosis (RO),Electrodeionization(EDI),Ultraviolet sterilization (UV),Polishing mixed bed(MB),Terminal micro filter (MF). The pretreatment part is ... proportion installment, mix them even before operating. This moment after going through mixed ion-exchange bed, H+ ions and OH- ...