My son has not been in my parents hot tub for over a year because we had suspected that he was getting an allergic reaction to it. Well he hopped in on Easter Sunday and we now know forsure that the skin reactions that he has had in the past have come from the hot tub. His face is covered in a rash and his eyes are swollen. My parents don't use chlorine but some other type of chemical that is suppose to be more natural.