| 摘要 |
PROBLEM TO BE SOLVED: To excellently control residual chlorine concentration in water W to be treated by a water treating device 1 for controlling the residual chlorine concentration in the water W to be treated by using a residual chlorine sensor S2. SOLUTION: A control means 40 for controlling an electric quantity to an electrolysis bath 12 is provided in the device so that a necessary amount of free residual chlorine is generated based on a measured value by the residual chlorine sensor S2. Due to correlation of a free residual chlorine volume generating by electrolysis with an applied electric current amount, control of the residual chlorine concentration is excellently performed when a chlorine amount with respect to a deficit residual chlorine amount is generated by electrolysis.
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