Hi, Bill. Thanks so much for the welcome and for the reply!

I've done some more research and I agree with your assessment; the Hiblow unit is not going to work - assuming that the pond is, in fact, twelve feet deep. I plan to go out in a kayak and see if I can get a measure of the actual depth. I'm now leaning toward a Kasco RA-1. It's a lot more money that buying a Hiblow compressor and doing everything a la carte. But, then again, I think that it is worth it to have a proven, turnkey package.

I have a well located approximately 50 feet from the pond. I think that I am going to have power run from the well to a location closer to the pond and then install a pole-mounted enclosure for the Kasco unit.