We have been in a friends hot tub three different times now, and every time when the jets come on it's like alka seltzer when you first put a tablet in a glass. You can see this affect and it seems to be fizz on the surface about two inches high. It goes in your nose , makes you cough, not pleasant at all. He is using a soft soak product and claims everything is in balance. I think something is wrong or is this normal for other than chlorine cleaners? We have been in other tubs,(chlorine) and have not experienced this. Thoughts?