Had hoped that will and increased by this Solar Plane our pool water by a few degrees in fact, it really works! When the sun shines on the Plane warms well by a few degrees, the pool water to a few centimeters under the tarp. Before you go to the pool, you should first run the circulation pump so that mixed the now heated water with the colder water. So we are excited and not regret our purchase! Note: Initially there was a bit too small pool tarpaulin for our pool, which we already annoyed, but after a few sunny days the pool tarp stretched by a few centimeters, and now it is even something precious. (Definitely better something precious, to be too small and could have been dirt in the pool) Oh, by the Solar Plane saves even the tarpaulin. From us, the buy recommendation for this good "invention!"
