So we're saying that generally the bottom of a pond in a northern climate, non-areated, will hoover around 39°F?
The geothermal story goes something like this:
We knew we wanted to use geothermal as our primary heat/central air. Geothermal company said if we had room for a pond to definitely go this route. We knew we wanted a pond on the site and had plenty of room, so this seemed like a no brainer. Turns out, after receiving our tax rebate this year, we actually got paid to put in our pond.
Unfortunately I did not come across this site until the above was all said and done. Now the task is trying to introduce as much oxygen as possible to create a well balanced "pecosystem" without over mixing and screwing up things with the geothermal system. (This is where I think the cold water spillway/siphon could play a role)
