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In solar heating systems the pool water circulates through a large heat mat or panel depending on your system, usually located on your roof, and absorbs the suns energy. The principle is similar to the way your a car radiator works, only these solar heat exchangers collect heat instead of radiating it. Most solar systems are flat black panels manufactured from high technology plastics which have been designed to resist weather and ultraviolet radiation or thin black tubes laid out as solar mats, the mats are the cheaper option.
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