Double Diaphragm - Windmill Aeration SystemHarness the power of the wind and save money on your energy bills with our Dual Diaphragm Windmill Aeration System. Features & Benefits: Ideal for large or irregularly shaped ponds over an Acre. The system can transfer up to 50,000 cubic feet of oxygen per month into your water source. Runs up to three airstones. Works in low wind conditions with as little as 3 5 mph Provides bottom up aeration for your pond, encouraging oxygenation of the water. Vent