BM,
The TGG pond is close to the airline that runs to the big pond(400 feet)....not the compressor. When Mike ran the numbers and determined that my existing system could support another diffuser and that another airline of about 400 feet was all I needed, then it became obvious that was the best solution for me in my situation. I just dug up the existing line at the closest point of approach and added a "T" and off we went to the TGG pond.
I'm still looking for a solar solution for additional yet to be built ponds which will be 1/2 mile from electricity...so prototype your system and let us know how it goes. Thanks.