| 摘要 |
PROBLEM TO BE SOLVED: To feed a chlorine compd. and to perform sterilization of water when water is cleaned by means of physicochemical action in cleaning water. SOLUTION: In a circulation flow path 9, a circulation means 12 for circulating water, an aggregating means 13 for aggregating suspended substances in water, a filtration means 14 for filtering the suspended substances in water, an electrolysis means 15 for feeding a chlorine compd. by electrolyzing water, a chlorine ion feeding means 16 for feeding chlorine ion to the electrolysis means 15, an electric source 17 for applying a const. electric current power source to the electrolytic means 15, a detecting means 18 for detecting an electric voltage value applied to the electrolytic means 15 by the electric source 17, and a displaying means 19 for judging the existence of chlorine ion fed from the chlorine ion feeding means 16 by the output signal of the detecting means 18 and displaying exchange of the chlorine feeding means 16 to a user when there exists no chlorine ion, are provided.
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