Solar heaters for pools. any ideas on how to make one?

Drew C asked:


I have an in ground 13,000 gallon pool that I use a solar cover on to retain heat, but I would like to swim earlier and later in the year and I was thinking of building my own solar heater. Your suggestions are welcome please! I had thought of a 6′ X 3′ X 6″ deep box that would have densely packed piping going back and forth to the other side where the water would be returned to the pool. The class topped box would concentrate the heat and warm the water passively I believe. Any other suggestions or suggestions on what materials to use? I can draw the water from the filter without having to add a seperate pump.
I am planning on putting the unit on my Shed roof, not my house, so the limited size is important.






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