| 摘要 |
PROBLEM TO BE SOLVED: To provide a carbonic acid bath for easily recognizing the exchange time for carbon dioxide without performing the troublesome work of checking the residual amount of the carbon dioxide when continuously utilizing the carbonic acid bath.SOLUTION: The carbonic acid bath in which carbon dioxide dissolved hot water in which the carbon dioxide supplied from a carbon dioxide cylinder 15 through a carbon dioxide supply path 14 is dissolved is supplied to a bathtub 2, includes a valve 16 provided in the carbon dioxide supply path 14, a detection means for detecting the opening time of the valve 16 or the opening time and opening degree of the valve 16, a reporting part 32 and a control part 4 for performing reporting in the reporting part 32 when the carbon dioxide residual amount in the carbon dioxide cylinder 15 estimated on the basis of a detected result by the detection means becomes equal to or smaller than a predetermined amount. |
