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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.
Click here to browse solar covers. Tip: A clear solar cover will allow more sun (and heat) to penetrate into the pool, but will also allow UV rays through (which will burn-off FC). A solid-colored cover will not let as much heat into your pool, but will better protect your FC from burning off.