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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.
Solar blankets most definitely work and help heat your pool. They are one of the easiest and most cost effective methods for heating. How much do they heat your pool? Thats dependent on a lot of variables, such as initial pool temperature, sunlight, temperature fluctuations (day vs night), pool size, etc.