The "hypotheses" about links between autisim and thimerosal have been pretty thoroughly debunked (over and over again). No reputable study that's been done to date has found any link and the "studies" that have found such a link have all been seriously flawed or downright fraudulent.

To make wild suppositions about chlorine and autism is, I think, irresponsible. Just as the unfounded vaccine scare resulted in some children not getting vaccinated against real and serious threats, a chlorine scare that results in insufficiently sanitized drinking and bathing water may well cause more people to contract real and serious diseases.