In this article they're claiming it was caustic soda they tried to up the dose on though. That stuff doesn't have a particularly strong odor like chlorine and chlorites.

You'll taste it immediately sure and only a dumbass would swallow it, but depending on how high they can push the limits, it could still be a pretty rough day for anyone who burns the inside of their mouth, or the poor bastards who step in the shower and spray that stuff directly onto their face and eyes with no safe running water to wash it off with.

On the plus side, the pipes would get a nice clean though.