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To: Gary H who wrote (88995)	8/20/2002 7:48:17 PM
From: E. Charters	Read Replies (2) \| Respond to of 116795

Chlorine is heavier than air. This is why if there is a chlorine gas attack you should carry your dog in your arms. But can it find its way into the upper atmosphere by evaporation and convection? Suspect the worst is the first law of prejudicial scientific investigation. 50% of the time you will be right and that is sufficient to look like a genius. We don't want to return to Typhoid Roulette of the 19th century, but there are other ways to purify water. Curiously, one of the better ways is to use ozone. That should put some back where it is needed, as ozone is lighter than air. Isn't it?

To: Gary H who wrote (88995)	8/20/2002 8:00:08 PM
From: maceng2	Read Replies (1) \| Respond to of 116795

So much for all the back yard swimming pools No problem with the swimming pools or the bleach you use to clean the bathroom with. Those sources of chlorine do cause some problems but do not (as far as we know) effect the ozone layer. There is a group of very stable chlorine compounds that are unaffected by any other chemicals until they drift up into the ozone layer where the presence of ozone and ultra violet light can cause problems to the ozone layer. epa.gov this is the source link. It looks good to me. navyseic.dt.navy.mil The compounds are usually in things like refrigerators. They were also used for fire extinguishers. As a high school student I was given a presentation in the early 70's showing how wonderful these CFC's were to the modern world. Also a review of the chemistry of flourine. I expect it was funded by companies that were promoting their use. At that time the ozone problem was unknown. Governments have made good progress on this subject imho. Compared to other potential problems with the environment.