| 摘要 |
PROBLEM TO BE SOLVED: To provide a circulation type flush toilet, capable of efficiently performing ozone aeration in a discoloring tank. SOLUTION: Ozone aeration is performed for the pump operation time (second)×100 sec. (7,000 sec. at maximum) by repeating the processing in the steps S40 to S65 until the pump operation time becomes '0'. In the case where a circulating pump 14 is re-operated in the course of the ozone aeration process after the stop of the circulating pump 14, the ozone aeration time is (the operation time of the circulating pump 14 before re-operation×100 sec. - the ozone aeration time after the circulating pump 14 is stopped before the re-operation + the operation time of the circulating pump 14 after re-operation×100 sec.). Thus, the ozone aeration time is controlled according to the operation time of the circulating pump 14 for circulating the treated water discolored by ozone aeration in the discoloring tank 8 as washing water to a flush toilet stool 3, so that the treated water can be efficiently discolored at low cost.
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