Several folks here have geothermal loops in their pond. With any luck at all we will put one in our pond when we build our house on the property. It is my understanding that geothermal loops in ponds are fine but that you should not aerate the pond for the reason that JR1 explained.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)