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Originally Posted by Happy Monkey
Not bacteria, the chemical bromate, which is formed when sunlight hits .
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From stevecrm's first link, the manufacturer claims...
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Reduces sunlight penetration, therefore eliminates duckweed and algae growth
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From stevecrm's second link, the manufacturer claims...
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Reduces penetration of Ultra Violet rays, precluding growth of algae and clogging weeds.
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It was the CA water dept's idea that they might prevent Bromate, but the ball maker doesn't make that claim.