| 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 a water temperature sensor 33 for detecting the temperature of the water stagnating in the machine and when the temperature captured from this water temperature sensor 33 falls to, for example, <=3 deg.C, only the circulating pump 6 is operated even during the standby for operation to circulate the water of the water storage tank 1, by which the freezing of the stagnating water is prevented.
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