I don't know of ANY place in the States that still uses pure chlorine on a regular basis, but in my town, they DO use it (once a year) to flush the lines in the summertime, they send out notices in advance.Another caution...with chlorine you can draw water into a bucket or barrel and especially with aeration, the chlorine will readily dissipate. Not so with chloramine as it remains stable much longer which is why many municipalities are switching to it. So especially if there is chloramine in your supply water, ensure that you use sufficient conditioner to neutralize... and extra conditioner may be required if the water authority has increased the dose.