Thanks Clover and Chemgeek for your comments , I was in the tub tonight and did not think about ozone at all, looked up at the northern stars and appreciated the serenity my hot tub in rural upstate N.Y. provides. I agree with you guys, if we keep our tubs in working order and manage the water , we all will be just fine. I know having this tub, has made my life a little more easy and comforting, due to the arthritis I have.