My guess is these loops are going to float with or without aeration. That windmill with an airstone "does not can not" lower the bottom temp and eliminate stratification in the winter in this pond.These loops have to be under weighted and perhaps have the coils not spaced correctly within the loops. When the coolant is 26-30F it is going to freeze the water surrounding the pipes no matter the water temp.Weight them correctly and you'll be good to go.Theo is on target with the winter aeration approach for this pond.
