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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.
Many pool owners also use a solar blanket to retain the heat generated from a gas powered pool heater or heat pump. Most heat loss in a pool is caused by evaporation. By trapping the heat, a solar pool covers reduce evaporation by almost 95%, and will save you up to 5% on pool chemical usage (while the pool is covered). Solar blankets also act as a barrier to prevent leaves and debris from entering the pool, thereby reducing the time you need to spend on maintenance.