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Solar Covers heat your pool in two stages: first by absorbing solar energy to heat the pool, and then by retaining the heat to keep the water warmer longer. The small bubbles on the Solar Cover are filled with air that heats up when the cover is in the sun.
For those who do not wish to drag a cover on and off a pool everyday, there are many liquid additives that help retain heat by reducing evaporation. My favorite of these is Cover Free. To actually heat the pool using solar energy look at a Solar Heater. Solar Heaters work differently from Solar Blankets/Covers/Rings.