The cleansing apparatus is equipped with: an upright outer cylinder and a screw conveyor is rotatably provided within the outer cylinder. The screw conveyor conveys filtration media introduced through an inlet at the lower end of the outer cylinder upward to an outlet at the upper end of the outer cylinder. A drive section rotationally drives the screw conveyor. A control section controls the rotation of the drive section. A regulating blade regulates the upward movement of the filtration media is above the outlet and is coaxially with the screw conveyor. A cleansing liquid is introduced through an aperture above the regulating blade within the outer cylinder.