Why do fire hydrants have to be flushed? And why do they sometimes need to be flushed multiple times within one week?
It is required of water systems to have a flushing program to ensure that the chlorine level in the water supply system is sufficient to kill bacteria and provide fresh water.
The flushing frequency depends on the characteristics of each water system such as source of water, treatment, configuration of pipes, flow/use, and time of year (temperature).
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