PURPOSE: To permit a stool to be cleaned by ozone-sterilized water by a method in which ozonized water is sent to a nozzle in a stool and jetted by a pressure pump by using a bubble generator and an ozonizer.

CONSTITUTION: An ozonized water generating unit 1 is made up of a housing box 2, a bubble generator 3, an ozonizer 5, and a control circuit 10. The control circuit 10 is actuated to light the quartz UV lamp of the generator 5 to generate ozoe, and a motor 41 is operated to cause the reciprocal movement of a cylinder to send out air into the ozonizer 5 through a tube 44. The mixed gas of ozone and air is discharged from the holes of the hollow part of the generator 3 in a tank 6 in such a way as to dissolve ozone into washing water, and the washing water is sent to the nozzle of a stool and jetted by a pressure pump 9. Residual chlorine and trihalomethane in the washing water can thus be re moved and the stool can also be cleaned by the ozone-sterilized water.