| 摘要 |
PROBLEM TO BE SOLVED: To prevent the free residual chlorine concentration of the tap water stored in water storage tanks (elevated water tanks) of buildings and condominiums from lowering. SOLUTION: The water quality maintenance equipment 4 having an electrolytic cell 5 for converting the chlorine ions included in the tap water by electrolyzing the tap water to chlorine is installed in juxtaposition with the water storage tank 1. When the prescribed time comes, the water in the water storage tank 1 is circulated through the electrolytic cell 5 by a circulating pump 6, by which the free residual chlorine concentration of the tap water stagnating in water storage tank 1 is maintained at a specified range. The equipment described above is provided with an air temperature sensor 12 for detecting the air temperature in the machine and an exhaust fan 13 and when the air temperature captured from the air temperature sensor 12 rises to, for example, >=30 deg.C, the exhaust fan 13 is operated to ventilate the inside of the machine and to prevent dew condensation.
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