Abstract: A bubble generating apparatus includes a hollow shell having a plurality of bottom inlets through and a side outlet, a screw rod longitudinally mounted in the shell, a baffle threaded onto one end of the screw rod and suspended inside the shell above the bottom inlets, the baffle having a plurality of smoothly arched bottom notches for baffling intake flows of high pressure liquid to produce bubbles, and a knob fastened to one end of the screw rod outside the shell and rotated to move the baffle along the screw rod relative to the bottom inlets.

Abstract: A high pressure tank installed in an emulsifier and connected between a bubble generator and a water pipe to receive a liquid from a water pump for enabling the liquid to be delivered to the bubble generator for making bubbles, the high pressure tank having a venturi tube extended from one side thereof to the water pipe for enabling a part of the liquid to be guided out of the high pressure tank to the water pipe for circulation, and an air valve installed in the venturi tube for enabling outside air to be drawn into the venturi tube to mix with the liquid passing through.

Abstract: A combination water filter tank, which includes a rectangular housing, three transverse partition boards disposed in the housing and defining a first sedimentation chamber, a second sedimentation chamber, a third sedimentation chamber and a fourth sedimentation chamber, a water inlet for guiding water from an external water source into the first sedimentation chamber, a plurality of first longitudinal partition boards of different heights respectively disposed in the first sedimentation chamber, three L-shaped water guide boards respectively suspended in the second sedimentation chamber, third sedimentation chamber and fourth sedimentation chamber, a plurality of second longitudinal partition boards respectively disposed in the second sedimentation chamber, third sedimentation chamber and fourth sedimentation chamber on the middle at an elevation below the L-shaped water guide boards, and a water outlet for guiding water out of the fourth sedimentation chamber.