Over 90 Million Plastic Balls To Protect The City Of Los Angeles

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Over 90 million plastic balls cover the Los Angeles Reservoir in the Sylmar area of Los Angeles Wednesday, back to August 12, 2015. The city has completed a program of covering open-air reservoirs with floating “shade balls” to protect water quality. Photos by Damian Dovarganes/AP Photo.

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The 4-inch-diameter plastic balls block sunlight from penetrating the 175-acre surface of the reservoir, preventing chemical reactions that can cause algae blooms and other problems.

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