| 摘要 |
PROBLEM TO BE SOLVED: To achieve a large-scale cost reduction by downgrading in rank of pressure-resistant ability and the like for piping, vessels, valves, pumps and the like surrounding a reverse-osmosis membrane separation unit and lowering the power cost of pumps and the like in a manufacturing device for primary water purification provided with the reverse-osmosis membrane separation unit. SOLUTION: The manufacturing device for primary water purification is equipped with a reverse-osmosis membrane separation unit 1 having an operative pressure below 0.5 MPa.
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