Jet aerators have been used in tanks with 13 to 65 ft (4 to 20 meters) liquid depth. In deep tanks, due to the hydrostatic pressure of the bubbles, the initial and average bubble size is smaller than in shallow tanks. Smaller bubbles result in high mass transfer due to the following reasons:
- Higher surface area in the tank volume.
- The bubble stays in the tank longer due to the lower velocity of the rise.
- Higher pressure in the bubbles produce a greater driving force for oxygen transfer.
Mixing in deep tanks is provided from the bottom of the tank to the top. For this reason, jet aerators are not limited to just shallow tanks. The jet aerators provide maximum mixing near the bottom of the tank.