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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.
Pro: One advantage of solar pool heaters are that solar is the least expensive way to heat a pool. After the initial purchase of the solar heating panels you receive free heat from the sun. If you have a southern exposed area large enough to install at least 50% of the pool surface area in solar panels, and it's close to the filter system - you can very effectively use solar pool heating.