How a Norweco/Jet-style shaft aerator draws in air

The electric motor spins a hollow shaft and the submerged aspirator tip. As the tip spins through wastewater, it creates a low-pressure area near its openings. That pressure difference draws fresh air from the vent down the shaft. The air exits as bubbles while the spinning tip mixes the wastewater.

Follow the blue path for air and the green arrows for mixing.

Swipe the diagram sideways to see all the labels.

Animated mechanical shaft aerator cutaway An electric motor above the water spins a hollow shaft. Air from the vent travels down the shaft and bubbles out near the submerged tip, mixing the wastewater. Mushroom air vent Access riser Liquid surface Aeration chamber Center air intake Motor housing Stator windings Motor rotor Foam deflector Hollow shaft Aspirator tip

This simplified cutaway shows one vent arrangement and a flat foam deflector. Intake openings, cover vents, and tip geometry vary by model.

Norweco owner’s manual · Jet 700++ aerator