Introduce more oxygen faster with a 4400AF Surface Aerator. 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 19 in. (.5M) of water. The 4400AF Surface Aerator is ideal for ponds/tanks with surface areas of about 1 acre.