| 摘要 |
PURPOSE:To obtain an effective clarification device capable of permanently continuing a clarification function by introducing washing water into a filter tank and a biological treatment tank via a washing water introducing means and discharging the washing water via a washing water discharging means. CONSTITUTION:Clean water supplied through a clean water supply path 10 is introduced into a filter tank 5 and a biological treatment tank 8 by actuating a flow rate controlling valve 13 to control the clean water at suitable water amount in a state wherein the washing means of the insides of both tanks are regulated. Both tanks are washed and the respective washing water is discharged from the discharge ports 11, 12. In such a way, washing of the insides of the filter tank 5 and the biological treatment tank 8 relating to circulation and clarification of water of the bathtub is timely and properly performed by the washing water introducing means and the washing water discharging means which are capable of being automatically changed over. Therefore accumulation of contaminant into the filter tank 5 and deterioration of activity of microorganisms in the biological treatment tank 8 are previously prevented. The water of the bathtub is always circulated and clarified in a suitable state without expending human labor for maintaining the clarification. |
