Micro-bubble technology has been recognized to be a useful tool to purify water in lake or sea under pollution and to promote the growth of marine and agricultural products. In this study, the performance of Sadatomi's micro-bubble generator has been experimentally investigated in order to estimate the pump power required in the use at deep water level. In addition, an analytical model has been proposed to predict hydraulic performance of micro-bubble generator under any water depths and its validity has been confirmed.
