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Such equipment is made of one exchange column and one group of control valves. Inside the equipment, there are cation and anion exchange resin, when the water flow past the cation & anion exchange resin, the cation & anion will be removed, thus the desalination completed. The invalid resin will be regenerated by industrial HCI and NaOH.

The equipment adopted the fixed bed, Productd water in way of down flow, and regenerated in way of no top pressure upflow; the regenerant cation bed is HCI while the anion bed is NaOH.