I'm not sure how to read the performance chart. How many cubic feet of air is the output at 3 psi? Did you put an airline adapter on the pump and immediately jump to 1/2" or 5/8" ID airline from the pump to the pond? Or are you running the 3/16" line to the pond?
I immediately converted to 1/2" at the pump and run about 120' to the diffuser, just as I had done with the Ecoplus 5.
The output of the 7 is 7cfm @5.1 psi, which I think is twice what the 5 put out.
It's above freezing here today and no open water above the diffusers.
The diffusers are having no problem keeping water open on my larger pond but this one is set up in about 10' of water.
