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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 cover will help the pool water retain its heat at night. Without a cover in the winter, all of the solar energy that was collected during the day will disappear. Sometimes prolonged rainy or overcast weather will cool the pool even if a blanket has been used.