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The Los Angeles Department of Water and Power has now dumped 96 million balls into local reservoirs to reduce evaporation and block sunlight from encouraging algae growth and toxic chemical reactions. The balls are coated with a chemical that blocks ultraviolet light and helps the spheres last as long as 25 years.

In a creative attempt to protect California's waning water supply, Los Angeles released 20,000 "shade balls" into the LA Reservoir. According to researchers, shade balls could reduce surface evaporation by 85 to 90 percent, protect water quality by preventing chemical reactions triggered by sunlight, deter birds and other wildlife, and protect the water from rain and wind-blown dust.