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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.
Using solar pool rings is a cheaper alternative to heating your pool and reducing energy loss caused by evaporation. Solar pool rings are light and clear inflatable disks that are placed on the pool as a cover. Basically, they work like solar pool covers, but they can be disassembled for easier usage and storage. Solar pool rings, in fact, are known to be more effective than bubble pool blankets. Solar rings are just as effective as solar pool covers. A single ring can save up to 21,000 BTU of heat on a daily basis.