| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject apparatus keeping deionizing capacity by preventing the scale precipitation of a hardness component in a concn. chamber or an electrode chamber even in water to be treated containing a large amt. of a hardness component. SOLUTION: In an electric deionized water making apparatus 1 having a desalting chamber, a concn. chamber and an electrode chamber and obtaining deionized water from the desalting chamber by applying voltage across a pair of electrodes, a mixed soln. of containing an acidic soln. and a scale inhibitor is added to a conc. water storage tank 2 storing conc. water discharged from the concn. chamber and this added soln. is returned to the inflow side of the concn. chamber.
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