| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which the presence/absence of remaining water in a bathtub can be discriminated, within the required minimum time. SOLUTION: After a circulating path 3 from the circulating port 1a of the bathtub 1 to the suction port of a circulating pump 12 is almost filled with water by supplying a prescribed quantity of water to the path 3 from a water- supplying path 2a, in a state where the bathtub 1 is maintained in an almost empty state, the pump 12 is actuated and the time until a water flow switch 13 is turned off (water flow turn-off time) is measured. At discrimination of the presence of remaining water in the bathtub 1 thereafter, whether remaining water exists in the bathtub 1 is discriminated, according to the on/off state of the switch 13, when remaining water presence/absence discriminating time which is determined, according to the water flow turning-off time elapses after the operation of the pump 12 is started.
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