Pond Boss Forums AERATION Systems questions Advise on new pond

Welcome to the forum. O.K. your pond is round, and 9' deep. Is it 50' across, 500 feet across, 5,000 feet across? i.e. how many surface acres is it?

One acre of water, one foot deep is 325,851 gallons.

You want to bring the volume of water that is in the pond up to the surface a minimum of once per day, 2x day is better.

There are different lifting rates for different diffusers. It all depends on now many diffusers and how deep they are. See here for a chart of Vertex diffuser lifting rates: http://www.vertexwaterfeatures.com/aeration-lifting-rates

If you can tell us how large the pond is, I'll bet someone can tell you how large your airline needs to be. Usually you run black poly or PVC underground to a manifold box at the edge of the pond, then go with self-sinking 1/2"-5/8" I.D. airline in the pond itself.

Roughly .5 psi backpressure for every foot of water depth over a diffuser. So to find out what pump you need, you have to look at it's flow chart to make sure it can furnish the CFM of the air needed at the pressure required. In your case, it's 4.5 psi.