To reverse the California drought!
Designed to keep water clean
They are designed to keep the water clear of dust and animals who might pollute the supply, hinder the growth of algae, prevent chemical reactions between the sunlight and chlorine, and reduce evaporation.
Balls will save about 300 Million gallons of water
The balls are expected to stop nearly 300 million gallons of water from evaporating, which can provide a full year of drinking water for 8,100 people. They are also expected to cost $250 million less than the alternative: installing floating reservoir covers, which would have cost around $300 million.
L.A. Dropped 96 Million 'Shade Balls' in its main reservoir in an attempt reverse drought (Video)