I have no idea if chlorine could be a problem, but if you become
convinced that it is, you might look into an ozonator system for the
pool. I'm sure they're not cheap, but compared with the cost of
driving to a lake or the ocean many, many times over years, not to
mention the inconvenience, it might be worthwhile.

In the meantime, remind him to avoid swallowing any pool water.

Bill

Mary wrote:

> I have a question about swimming in chlorinated pools. My son had been
> really improving, his thyroid, everything was better. Then the hot weather
> came and now he is in a chlorinated pool almost every day.
>
> I think I see some regression, could this be from his body absorbing the
> highly toxic chlorine?