LOS ANGELES (CBSLA.com) — City officials on Monday plan to release 20,000 shade balls into the Los Angeles Reservoir to help comply with regulations for safe drinking water.

Shade balls are made of a black, plastic and weighted material that is used block much of the daily sunlight from reaching the water’s surface.

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Authorities explained the shade balls also help to protect against chemical reactions that may cause algae blooms and other environmental exposures.

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City officials added the addition of today’s shade balls will bring the total up to 96 million.

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This is expected to save 300 million gallons per year.