7 Waste water treatment equipment namely water treatment machines, filtering machines intended for wastewater treatment, machines for the disposal of liquid waste, waste water lifting stations, pump impellers, spiral pressing devices, suction pumps, wastewater pumps, waste water lifting mini-stations; hydraulic aerators and mixers, high speed aerators, namely hydraulic turbines other than for land vehicles; air blowers, other than for land vehicles; wastewater aerators, being machines; pumps and compressors as parts of machines, motors and engines; water aeration Systems comprising water pumps, air compressors and air blowers; agitators and mixers for circulating waste water;vertical turbine pumps;sludge pumps;apparatus for purifying waste water, namely, fine and medium bubble air diffusers