The All Pond Solutions 600IF is designed for submersible use only with adjustable spray bar to increase oxygen levels.Venturi aeration nozzle supplied to create bubbles, increase oxygen level of returning water. No air pump needed in principle.Venturi effect: As water is pumped back into the tank, it can also be aerated by a venturi pipe. This accelerates the water flow and draws in a stream of air from above the surface.You can only use the spray bar or Venturi aeration nozzle not both together.