Dwight, I agree with the loops in a pond. Around here they were talking about trenching the loops into the soil.
I remember a few years ago someone was having problems with their geo system that had coils in the pond. The geo guy was blaming it on having an aeration system in the pond. I couldn't understand why they said that. If the diffusers are placed correctly, during the winter the water temp at the bottom of the pond shouldn't change vs. non-aerated water.
I believe that early on there were a lot of contractors (maybe still are) learning how to build a geothermal system using on the job training. Since some really didn't know what they were doing, troubleshooting a problem was based on the "blame everything else first" troubleshooting technique. Blaming pond aeration fits that mold!!
