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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.
One benefit to having a solar pool cover is the price. Solar covers are a very inexpensive way to control the temperature in your swimming pool. You can pick up a cover at your local pool store or online for under $100, depending on the size of your swimming pool.