California may be experiencing the worst drought in 1,200 years. Covering the surface of a 12-billion-liter reservoirs with black plastic balls will block sunlight, preventing more than 1 billion liters of water from evaporation.They will also avoid the production of dangerous chemicals than can form as a result of reactions triggered by sunlight in chlorinated water. The state has now nearly 100 million “shade balls” ready to tip into its reservoirs.
Millions of black plastic balls will help California conserve water
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