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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 solar heater, combined with a solar pool cover can mean that over the course of a good summer your energy costs are kept to an absolute minimum. You may wish to combine solar heating with a backup heater if you want to extend your swimming season.