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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.
Pool Covers Retain Heat   Pool covers retain heat.   Most heat lost from a pool is from evaporation from the surface - over 95%. The cover will keep over 90% of the heâ¦at in the pool.   A pool cover will help to attract a small amount of heat, it is no substitute for a heater.