| 摘要 |
PURPOSE:To stably and continuously circulate, purify and sterilize bath water over a long time by arranging a backwashing means washing the filter material in a purifying tank by bath water at every definite time to an ozone sterilizing treatment tank. CONSTITUTION:Ozone supplied from an ozonizer 8 is dissolved in the bath water in a sterilizing tank 5 as numberless small gas bubbles through a diffuser 18. The bath water sent in a purifying tank 12 flows through the packed filter material in the purifying tank 12 from above to below and, during this period, the suspended substance in the bath water is filtered to purify the bath water. The purified bath water is passed through a heater or heat exchanger 13 through an electromotive three-way valve 11 to receive the supply of the radiation quantity, at the time of circulation to return to a bathtub 30 through a bath water emitting pipe 14. During the continuation of the filtering and purification of the suspended substance in the bath water, the suspended substance in the bath water is accumulated on the surface of the filter material in the purifying tank 12 and the filtering capacity of the filter material is lowered and, therefore, the opening-and-closing of electromotive three-way valves 10, 11 controlled at every definite time by a controller to backwash the interior of the purifying tank 12 by the bath water and the collected suspended substance is removed out of the system from a backwashing pipe 16. |
