Thanks to you both.....so far I have not developed a rash, but when I got home I took a triple shower!!!! We have had a very, very basic hot tub (leisure bay) since 2001, and I have tried to be meticulous with using the BacqaSpa chemicals. I am not that thrilled with them, though we haven't had one single issue with skin rashes or odors in the tub. Hubby changes the water about every 3-4 months...mainly because I use moisturizer every morning, and then the minute I get home from work I am in the tub.....every day that I am in town. We are going to be getting a new hot tub...before this one falls apart. What is the best chemical program to use? I think the new tub will have the ozone thing....so I don't have a clue...but, I do want something other than BacquaSpa. Thanks so much