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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.
This depends upon what time of your system is installed and will be greatly accelerated if you use a pool blanket to keep the added heat in the pool. For most solar pool heaters and with a pool blanket in place, an unheated pool will usually come up to temperature within three days or so during the spring and fall.