i am in zone 8a you might need to go deeper if the climate is warmer but there is a simple way to lay pipe deeper with little labor ,use a trencher they rent them . i had to hand dig because there was no way to get equipment on the dune i used . the water is 62 now but in the summer it will be 65 that is still cooler than what it was. i have already started a new loop in a different location for back up coolant it works great and anyone can do it if you have the land to do it on
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