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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.
The key to an efficient solar pool cover is a good fit from wall to wall so that the cover seals in warmth. When purchasing a solar blanket, measure the pool from side to side and end to end at the widest points, including steps and seating. This is the minimum size to order.