| 摘要 |
PROBLEM TO BE SOLVED: To efficiently dissolve air in bathtub water without using an expensive circulation pump and to improve operation efficiency in a bathtub system generating micro bubbles. SOLUTION: The bathtub water is taken out from a bathtub 1 to a circulation passage by a circulation pump 8, the air is dissolved in the bathtub water by an air/liquid mixing tank 9 via a three-way valve 11 and returns from a micro bubble nozzle 4 to the bathtub to generate the micro bubbles. When the air in the air/liquid mixing tank 9 is reduced, the three-way valve 11 is changed over to a side of a jet nozzle 3, and an air valve 18 and a discharge valve 20 of the air/liquid mixed tank 9 are released so that the bathtub water in the air/liquid mixing tank 9 is jet out and discharged from the jet nozzle 3 to the bathtub using a negative pressure generated in the jet nozzle 3 via a suction pipe 19 and simultaneously, the air is introduced into the air/liquid mixing tank 9.
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