So I've had the hot tub online since the middle of October with no issues, crystal clear water, checking water all the time. In the last couple weeks I noticed some itchy red dots on the insides of my biceps and my sides. They got worse and turned into a really itchy rash type thing. I haven't gone in to the tub for almost a week, and after antihistamines it's almost gone now.
My wife goes in the same amount as I do but didn't get anything. The doctor says those areas of the body the skin is most sensitive so that's why I got the itchiness there. She figured it might be the hot tub. In the last several weeks I've been testing with new test strips (I know, I should get the really good test kit...) that show the stabilizer levels, or cyanuric acid? If I'm reading it right, it's definitely between 150-300 and a very deep purple. Is this what is causing irritation? So when these levels get high the only thing to do is to drain all or part of the tub and replace with fresh water right? I didn't know that would build up so fast! It's only been a couple months and I thought tubs could go for 4-6 months before being drained and refilled etc.
Please help with ideas, my other stats are as follows: