Oh yes, carbon definitely removes free chlorine--I have a big undersink filter in the kitchen primarily for that--and an A/B comparison with unfiltered water can be night/day, depending on the season and how much they're chlorinating. Takes out all sorts of organics, too.

Since I can usually taste/smell ClO2 in treated water, polishing it with carbon makes perfect sense (scents?).

Cheers,
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--Rick