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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.
A pool solar cover or pool solar blanket is a floating swimming pool cover which insulates the surface of the pool water. The majority of the heat which escapes from swimming pool water is lost through the surface of the pool, and a solar blanket drastically reduces heat loss. Also, it allows some of the sun's energy to go through the cover and into the water, where it turns into heat.