| 摘要 |
PROBLEM TO BE SOLVED: To properly keep a silver ion concn. required for sterilization and to keep bath water always pure by providing a silver ion concn. measuring device at a circulation passage of the bath water in a system provided with a bath tub, a silver ion forming device and a filter and in which the water in the bath tub is circulated through a water passage pipe. SOLUTION: The silver ion forming device 3, a circulation pump 5, the silver ion concn. measuring device 6, etc., are disposed at a circulation passage in which the water from the bath tub 1 is circulated through the water passage pipe 2. An arithmetic treating device 7 is connected to the silver ion concn. measuring device 6, and the arithmetic treating device is connected to a controlling part 8 of the silver ion forming device 3. In the silver ion concn. measuring device 6, power supply is executed for a fixed time between two electrodes when the circulation of the bath water is stopped to collect the silver ion in the bath water on the surface of a negative electrode. Thereafter, the current between the electrodes is measured while applying the electric potential within a fixed range to the electrodes. Then the measured value is input to the arithmetic processing device 7, and the system is controlled so that the silver ion being not enough to a prescribed value is replenished from the silver ion forming device 3 by interposing a controlling part 8.
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