PURPOSE: To liberate a person from the control of washing of filter by constituting the system in such a way that by pushing a water discharge switch the bathtub water flowing reversely through a filter is discharged after the washing of the filter and the bathtub water is simultaneously discharged through the discharge valve of the bathtub.
CONSTITUTION: A circulation water passage 5 provided in its way with a circulation pump 6 circulating the bathtub water in the outside of bathtub is connected with the bathtub 1, and the filter 6 is provided in the passage so that the bathtub water flows through the filter 9 in both the normal and the reverse directions by using changing-over valves 7, 8 and a bypass 10. In a controller 16, when a filtration switch 18 on the operation board 17 provided with a water discharging switch 19 and the filtration switch 18 is pushed, the bathtub water flows through the filter 9 in the normal direction to be filtered, and when the water discharge switch 19 is pushed, the bathtub water flows through the filter 9 in the reverse direction to wash the filter 9, and then is discharged through the water discharge passage 11 which is connected to the part of normal flow inlet of the filter 9, and at the same time the bathtub water is discharged through a discharge valve 14a provided to the bathtub 1.
KURODA ENYO
SONEDAKA KAZUNORI
