The Los Angeles Department of Water and Power put these millions of black balls in to the Ivanhoe Reservoir. This action is took forward to protect the drinking water. According to researchers, the water needed to be shaded to restrict the formation of bromate(potentially harmful) a carcinogen, which is formed by the reaction of bromide, chlorine and direct sunlight. The project was designed to stop the mingling of bromide, chlorine and direct sunlight to protect 10 acres of Ivanhoe Reservoir. Today approximately about three million black plastic balls help to deflect the UV rays.
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