In 2007, the Department of Water Protection in Los Angeles detected high levels of bromate, a carcinogen that forms when bromide and chlorine react with sunlight, in Los Angeles’s Ivanhoe Reservoir. Bromide is naturally present in groundwater and chlorine is used to kill bacteria, but sunlight is the final ingredient in the potentially harmful mix. The 102-year-old facility serves about 600,000 customers downtown and in South Los Angeles. When the Department of Water Protection realized the problem, they began construction of a new underground reservoir in Griffith Park, but while the new facility was being built they had to determine a way to keep the sunlight out of the water.
Here specifically black balls were used as they are perfect for absorbing the incoming radiations!! It sure has taken a lot of sweat to get the job done.
"looks more like a black pearl being rolled over"
"it contains more than 400000 balls and its being cleaned up after the completion of the project"
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