PURPOSE: To catch dust on a water surface reacting according to the change of a water level by connecting an inlet port cover capable of being loaded/unloaded on an inlet port and provided with an inlet side communication tube connection part to a dust catcher floating on the water surface and on the upper side of which a filter is loaded and provided with a discharge side communication tube connection part on the lower side and incorporating a floating body in the inside by a communcation tube.

CONSTITUTION: The inlet port cover 3 can be loaded/unloaded on the inlet port 21 and is provided with the inlet port side communication tube connection part 2. The discharge side connection coupler 6a of the discharge side communication tube connection part 6 of a dust catcher main body 5 on the upper side of which the filter 7 is loaded and on the lower side of which the discharge side communication tube connection part 6 is formed in connected to the inlet side connection coupler 2a of the inlet side communication tube connection part 2 by the communication tube 8. The dust catcher 5 incorporates the floating bodies 15 on both sides, and always floats on the water surface. The dust and water floating on the water surface enter from a dust entry part 5d, and the dust is eliminated by the filter 7, and the water passes the discharge side communication tube connection part 6, the communication tube 8, and the inlet side communication tube connection part 2, then, it enters a massager main body 1.