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Wow! Lots of great info, Chem Geek. Much appreciated. About the only question I can give you an answer to right now, since I'm not at home is the temp. We don't like the "hot" soaks so we keep them temp at around 95*. It's perfect for relaxing for longer periods of time. Keeps the body toasty warm while the cool breeze is whipping around our heads. The spa shock is non-chlorine type as that is what I asked the little wife to buy just after we got the tub and after I started reading some posts here. Just not sure what brand it is.As far as the chlorine amount, it's probably best to be a little over chlorinated than under chlor? I think I also read somewhere that skin specialist sometime prescribe their patients to chlorine baths to help whatever skin condition they have.Again, thank you so much for taking your time to explain things to me and to ask questions about the condition and products I use. I ordered the test kit that you recommended yesterday, so I'll be able to test with hopefully, better results. I also took a sample of my water to the local pool supply and found out that the Ph was low and the TA was also low so the computer printout suggested 5oz of Alkaline increase. I had also added too much chlorine when I refilled with fresh water, so she said I should not add chlorine for about two weeks.