Bought this on Ebay about 2 years ago. It's 2 panels 2' x 20' I mounted back to back on top of the pool fence. Have then titled about 45 degrees to the south. Panels are made of black PVC tubing that has multiple tubes running end to end. The water enters in the top, runs down the length of the panel and back again. Hooks up between the filter outfeed and pool inlet. This one came with a diverter valve that limits the flow thru the panels. Idea flow is 12 - 15 gpm.
Pool temperature, on a bright sunny day, raises about 1 degree an hour. The pool is 20' x 40' so it holds about 20,000 gallons of water. Before I installed this about the same sunny conditions, it would raise only a half degree and hour. Nice thing that I have also tried that if the pool temps get too high, you can run the filter and panels at night and it will act as a radiator and cool the pool off a few degrees.
For the first year I just had them laying out on the deck but decided last year that they were worth keeping. Have hard piped them up for easy removal during winter months.
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