Chlorine in drinking water is one problematic area of concern for me when it comes to IC. But, dipping in a pool with chlorine----one should really try to avoid that. In today's world there are many options to the standard chrlorinated pool. Research correlates an increase in bladder and colon cancer with even moderate levels of chlorine exposure. The following article is on this subject because chlorine level in this particular pool were too high. But, imagine the extreme of what happened in this article and then imagine the same chemical toned down to an "acceptable" amount. Dont you think that it just dows the same things on a micro level? Reasonable? See for yourself: http://www.naturalnews.com/023740.html