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is my pipe? Sorry for the double entendre. This is a tangential subject to my thread on radiant cooling. I have an existing 1 1/4 pipe of Polyethelene tubing that runs out of the basement of a nature center. Runs underground to a lake and loops around the bottom of the lake. It used to be connected to a geo thermal heat pump, but someone got rid of it when it turned 25 years old and replaced with residential air source heat pump. ( what a maroon.) I now have two stubs of the tubing sticking out of the basement wall. How can I figure the length and usefulness of this pipe? I would like to use it to supplement the existing cooling which is not cutting the mustard. Thanks