The high-performance design of this aerator uses a single open propeller that creates and pushes water droplets into the air allowing efficient transfer of oxygen to the water. Agitation and movement created by the process spreads the oxygenated water throughout the body of water. These units can operate in as little as 15 in. of water. The 2400AF Surface Aerator with a bottom screen is ideal for ponds/tanks with surface areas of about 1/2 acre. The bottom screen is used to keep debris and other material out and ensure proper operation of your unit.