first time test with TF-100

You do not appear to be using PoolMath correctly. The left column is your NOW test results and the right column is your TARGET. If your target pH is higher than your now pH, of course it says 0 acid.
 
I use a separate window and pull all my pics from postimage.org.
 
For casey

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Which one to choose in pool math

15.7%
28.3%
31.45%
34.6%
14.5%
29%

I need to lower PH
Whatever the jug says is the strength is what you enter. There's no point plugging in 22 Baume and spending a week hunting for it. Go buy the strongest muriatic acid you can find and use that value. Normal stuff is 20 Baume. The "low-fuming" stuff is 10 Baume.
 
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