YP, When you visit Todd Overton ask him about either a Vertex Air One Plus or Air One XL depending on the length and width. You are looking for a minimum of 4861 GPM system. The lifting rate is important but spacing (placement) of the air station (s) is critical also. If your pond is 20 ft deep and 300 ft long and 200 ft wide placing a 4 head station in the center will provide the same lift as a pair of 2 heads spaced 100 ft apart mathmatically speaking.In reality you will have more vertical current on the 4 head area than using the pair,so to affect all of your gallons in this example you may be better off with a pair of stations using the same small 2.5 cfm compressor.Todd can size you the proper system.
