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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.
The first and cheapest option is a cover for your pool. Using a pool cover helps your pool retain heat and significantly reduces evaporation. A solar cover is highly recommended, whether or not you are using anything else to heat your pool. It is, hands down, the most bang for your buck when it comes to keeping your pool warm.