CIRCULATORY/CLEANING DEVICE FOR BATHTUB WATER AND OPERATING METHOD FOR CIRCULATORY/CLEANING

摘要

PROBLEM TO BE SOLVED: To eel a soil component off a filter medium and at the same time, loosen the mutual interlocking of the filter media. SOLUTION: When a backwash operation A is performed, a solenoid valve EV1 is closed and a solenoid valve EV2 is opened, and a five-way valve V1 is operated to drive a pump P and consequently, a bathtub water is sent into a cleaning nozzle through a first introduction pipe 3a, the five-way valve V1 and cleaning water piping 5. On the other hand, when a backwash operation B is performed, the solenoid valve EV1 is opened and the solenoid valve V2 is closed, and the five-way valve V1 is operated to drive the pump P, so that the bathtub water is sent into the lower chamber of a purifying tank through the first introduction pipe 3a, the five-way valve V1 and a first return pipe 4a.