Free Chlorine Destroys Germs: Chlorine remaining in water after the chlorine demand is satisfied and combined chlorine is formed is known as “free chlorine.” This is the chlorine portion available for disinfection. Many waterborne germs are either killed or rendered incapable of reproducing, helping to prevent waterborne disease outbreaks. The time required to destroy viruses, bacteria and parasites present in raw water at a given chlorine concentration varies with the organism and is known as the “contact time.” - See more at: http://www.waterandhealth.org/chlorine-residual-public-health-safeguard/#sthash.t6Pn3jy8.dpuf
Basically they are adding more chlorine than normal for a short period of time....
Depending on how high they take the Cl2 levels, they can wipe out a carbon block or carbon bed very quickly. Be extra careful when making RO/DI water during periods of elevated chemical dosing by cities. I'd just turn units off if possible.
I'd wait at least a day after the main line flush. You can use a chlorine test kit on your tap water to see if the levels have come back down to normal ranges.
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