Tempering tank for hot water system
It's found in nature but is resistant to chlorine. Heat is the best
killer. Ironically, if you read deeper into the studies, you find that
homes with electric water heaters and copper plumbing had a
significantly lower incidence of the bacteria compared to homes with
galvanized pipes.
They think the bacteria feeds on iron and is killed by copper. But the
studies are somewhat inconclusive on that.
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