PROBLEM TO BE SOLVED: To provide a bath water circulation system with a purification device capable of rationally purifying hot water inside a circulation circuit, and a method of purification for removing dirt inside the circulation circuit before the start of operation or after the operation of the bath water circulation system.;SOLUTION: The bath water circulation system comprises the circulation circuit for circulating hot water inside a bathtub 1 to the outside of the bathtub and a circulation pump 4 disposed inside the circulation circuit. A washing water feeding means is connected to the circulation circuit via a first switching valve 6, and a washing water draining means is connected to the circulation circuit via a second switching valve 7.;COPYRIGHT: (C)2005,JPO&NCIPI
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