Recently, the accidents caused by LegioneUa species have became a serious problem at public baths. Tb solve the problem, it is necessary to keep the residual chlorine in water at predetermined level by disinfectant. In this study, we aimed to understand the situation of chlorine disinfectant decrease in air bubble bath and ultrasonic bathtub. As the experiment conditions, we controlled to change water depth, amount of air, water temperature, volume of circulating water, gauge of air nozzle, and so on. In order to evaluate the behavior of disinfectant in water, the divergent coefficient was used to observe the decrease in the level of disinfectant over time. Regarding of the behavior of disinfectant in water in the bubble air bathtub and Whirlpool bathtub, the results were obtained respectively.%1．はじめに近年、浴場施設がいたるところに建設され利用されている。しかし、浴場施設でレジオネラ属菌の発生によって、大きな事故が起きている。この原因は浴槽の構造に起因すること5）や維持管理に関連することが想定されている。浴槽における消毒剤の減少は、ヒトの入浴による浴槽水の汚濁が最も大きな要因である。
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