Hello, I'm a recent convert to TFP and wanted to thank you friendly and helpful folks for literally saving my skin. I had developed a severe rash and had been to a Dermatologist several times. Tried different laundry detergents, soaps, shampoos, threw away my clothes and bought new ones. I suspected the spa but I was doing the same thing for 20 years with no problems. I was using the cheap OTO test which always showed chlorine but it was all combined chlorine. CYA was off the charts since the pool stores kept telling me to keep adding Dichlor. What I hadn't accounted for was that my girl friend was now using the tub as much as I was and I just couldn't add enough Dichlor to sanitize. I'm all better now thanks to you guys setting me straight. Actually I've become somewhat obsessed with water chemistry now and sometimes test several times a day.