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A solar fish is actually a device used to keep Swimming Pools warm and reduce water evaporation. A solar fish is a small plastic fish filled with an alcohol and wax based liquid. The fish has a small opening so when tossed into the water, small amounts leak out slowly. A film is developed on the top of the water creating a solar blanket. It traps the sun's heat during the day and holds it at night.

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12y ago

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