Introduce more oxygen faster with 8400AF Surface Aerators. The high-performance design of these aerators uses a single open propeller to create and push 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 20 inches (.6M) of water. 8400AF & 2.3AF Surface Aerators are ideal for ponds/tanks with surface areas of about 2 acre.