Thank you for your response, I do not have an ozonator although the spa did have one (pervious owner removed) I still don't quite understand the pros and cons of having one. I am sure there are many posts on that subject. so anyway what I normally do is get out of the tub dose and than close the cover pretty much right away NG right that is keeping the chlorine gas in ? and I will try opening 10 minuets or so before getting in easy enough, but at least I know its normal.