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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.
In my experience, a solar blanket helps to heat up the water by about 4 to 5 degrees. The cover (I use a blue cover) holds in the heat from the sunâs rays to warm up your pool with no extra cost to you. The outside temperature will also determines how warm your pool will get.