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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 Solar Safe Pool Cover is a passive solar heater, helping to convert sunlight into heat for your pool water. This can allow you to swim earlier in the spring and later in the fall than you would in an uncovered pool.