Our line was in the water in a similar fashion however we did not use it year round. There was a valve near the shore to drain the line. I think he would blow air down the line to clear as much as possible. As long as there is room in the pipe for expansion as it freezes there is no problem. Being used all year though? I would expect problems. Heat tape or wire would be a start. How about where it enters the house? I assume it is shallow or not buried all the way to the inlet?
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