BATHING SYSTEM

PROBLEM TO BE SOLVED: To permit the discharge of residue of bacteria or the like, perished by thermal pasteurization operation, quickly to the outside of a bath device. SOLUTION: Backwashing operation, wherein a circulating route 3 is separated from a bathtub 1 and hot-water is passed into a direction reverse to that upon purifying operation to drain the same to the outside of the route, is effected subsequently after the execution of the thermal pasteurization operation. The circulating route 3 is separated from the bathtub 1 to secure a closed loop route permitting the circulation inside of instruments and the thermal pasteurization of the closed loop route as well as a filter 8 arranged in the same route is effected by heating the hotwater in the route to a required temperature. According to this method, the residue, such as bacteria perished by the thermal pasteurization operation for example, can be removed quickly to discharge the same to the outside of the system by the backwashing operation whereby the bathtub water can be prevented from being contaminated.