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Are solar blankets used to heat the pool, or retain the heat?
Pool covers are mostly good for retaining heat. Most heat loss from a pool is from evaporation from the surface - over 95%. The cover will keep over 90% of the heat in the pool. A pool cover will help to attract a small amount of heat, but it is no substitute for a heater. If you use a heater, then a cover will save over 50% of the heating cost. If you use solar, which works in almost all geographic areas, then the cover will retain the heat overnight and allow the solar to bring the pool up to the 80's in 1 to 3 days. Liquid covers (Tropical Fish) work about 50% as well as plastic covers
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