Pond Boss Forums AERATION Systems questions Oxygen readings. What next?

Move it out to 7'-8' water depth.

I looked at the link you posted for the system. I have to think that they are pulling those specs for the psi/cfm out of their hind end. Here's why.

Typically max cfm readings are done at 0 psi backpressure. They are saying that the compressor produces a max of 5.76 CFM and then their spec says that is at 16' water depth or 6.9 spi. They go on to say that the compressor produces 3.87 CFM @ 49 feet and 1.98cfm at 229.6 feet of water depth.

I find that really, really hard to believe. A 3/4 hp Brookwood rocking piston compressor from Vertex produces 5.6 cfm at 0 psi, Here are the other psi/cfm specs:
SYSTEM HF 2,3,3+
VOLTAGE 115 Volt

PSI CFM
5 5.22
10 5.10
15 4.93
20 4.73
25 4.55
30 4.34

The Vertex compressor is only rated to 30 psi or abnormal wear will occur.