Building a Solar Thermal Heater

Been thinking about this as my pool is getting cold already.  First build is one I have seen in the past with irrigation pipe.  Basically you make a big circle with the stuff.  Second build is definately the poor makes solution, using the cooling radiator from a frig.  It looks neat, but….little leery of using the cooling parts from a frig in water that may be drunk by accident.


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