PURPOSE: To remove the dust and dirt in a bath tub and the dust and dirt in a bath furnace with a circulation type filter device for bath tubs and bath furnaces.

CONSTITUTION: The water or hot water in the bath tub is pumped up by a pump 4 from a filter 1 through a piping 5 and is sent through a piping 6 into a filter 2. The filter 2 attached with a piping 8 with a pump operating valve is connected via a piping 7 to a suction port 12 to the bath furnace 11 by a joint 9 at the front end of the piping 7. The hot water is returned through an L-shaped filter 3, mounted at a discharge port 13 from the bath furnace 11 to the bath tub, to the bath tub 10.