Pond Boss Forums AERATION Should I aerate? What’s the best type of aeration?

I am not sure if their term for "diffuser" is for each cylindrical diffuser or for the group of 4 that are on one plate. Vertex specs are calculated at 1 psi at each membrane diffuser, so if there are 4 membranes on one AirStation, then the water lifting specs are @ 4 cfm.

The AirMax 1 hp compressor puts out a max of 7.1 cfm (that is at its shallowest with 0 backpressure). I cannot find a back pressure/cfm chart for it. You will see roughly 7.5 psi backpressure @ 15 feet. The 1 hp rocking piston Vertex compressor puts out 8.6 cfm @ 0 backpressure, I will have to dig in my literature to find the back pressure/cfm chart. The 1 hp Gast rotary vane compressor puts out 13.2 cfm @ 0 psi and 10.0 cfm @ 10 psi backpressure (roughly 20' water depth). The AirMax compressor says it should be rebuilt every 12-18 months, the Vertex compressor goes at least 3 years before needing a rebuild and the Gast rotary vane will go at least a year more than the Vertex before it might need a rebuild. I have a 3/4 hp Gast rotary vane compressor in my pond running at 18' depth (9.5 psi backpressure) and while I don't run it for approximately 4 months out of the year, it's going on year 6 without needing a rebuild. The Stratus Rotary Vane compressors @ Stoney Creek/Easy Pro are made by Gast.