Aspirators vs. Agitators - Tech Talk 8
Aspirators and agitators are the aeration devices most commonly used on hauling tanks when the stocking densities do not require the use of pure oxygen. Agitators use a small motor (normally 12V) to spin a paddle which is in the water. The paddle splashes the water, which adds oxygen and removes carbon dioxide. Aspirators also use a small motor, which spins a small venturi device. Air is pulled down through the shaft and exits the venturi underwater, causing a draft of bubbles. Agitators are the best choice for heavy stocking loads because they transfer more oxygen than aspirators. Aspirators are a good choice for smaller stocking densities, and they are much quieter than agitators.