Howdy and welcome. A few possibly pertinent thoughts:

If swimming is he primary goal, consider your fish stocking choices carefully. BG have a (sadly, deserved) reputation for nipping at exposed swimmer's flesh. After years of denial, I have to testify to this fact myself.

If you have no other use for electric at the pond side (I understand wanting lights, etc. - I have a 50A 220VAC service at one pond, and pipe compressed air to the second one.), it is cheaper to run air from a remote aeration pump to the pond than it is to run the electric. Quieter pondside as well.

IIRC one has to pull a fountain from the pond on the Winter, or possibly let it run all the time. I have no experience on this myself, so get actual user inputs on this situation.

You probably want to put the main/most diffuser(s) in deep spots, but having one in shallow water will allow for Winter aeration when the pond is covered with opaque ice with the lowest risk of supercooling.

Dig test holes to see what soil(s) you have at your prospective pond site(s)!!!


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]