... on reverse osmosis,with filter and softener,add mixed bed,EDI to high desalinization ratio,PLC programmable controller The system ... osmosis (RO),Electrodeionization(EDI),Ultraviolet sterilization (UV),Polishing mixed bed(MB),Terminal micro filter (MF). The pretreatment part is ... can make ion derectional movement under the role of DC electric field, thus finishes water’s deep desalination, It can ...