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Read this thread: http://www.poolspaforum.com/forum/index ... opic=12645 I had the same problem, but had it somewhat more in control from reading and experimentation. I've been working hard at understanding and getting the pH/TA battle even more tightly in control. I am currently at: 280...

Wow, thanks for all the feedback. I carefully re-ran all my tests today assumign the Taylor test is correct and checking the color reads of the other tests carefully and had my wife independently check colors in parallel. Results: Taylor pH: pH > 8.0, 3 drops acid demand to get to pH 7.5...

I went back to my records. Earlier when I was believing the Taylor test results, I was treating with significant amounts of pH- and later Muriatic Acid (carefully) when I ran out of pH-. This reduced pH and TA. When the Taylor test started looking more reasonable (< 7.8), I stopped for the...

Caveat: Cross-posted on Pool & Spa Forum - no disrespect. Hi, I have a relatively new spa and am struggling with correctly measuring pH. Simply put, I don't know which test to trust. With the ranges I am seeing below, I am concerned my true PH may be too high and I will have problems with...