Let's really confuse, in reality, any TA of 50 or more.
The ranges in Recommended Levels are built such that you do not need to bother with understanding CSI, if you can stay in all those ranges.
The TF100 information comes from Taylor. Scratch it out or blot it out with a magic marker.

As you have a plaster pool, if you cannot stay in the ranges of pH, TA, and CH, you then must understand CSI. And manage that value to a range of preferably between -0.3 and 0.3.
 
Let’s confess even more,
The goals were built trying to get people to aim for a lower TA level. Last year we did an audit of over 15,000 test results volunteered from PoolMath and found the average TA of users was around 90-100’ish. Additionally the average pH was around 7.5 if my memory served me correct. It was clear looking at things people were content actively aiming for a low pH and a high TA.......and was using a fair amount of acid to do so.

When we altered the numbers we altered them wanting users to allow their pH to drift upwards. We want users to aim for a lower TA. The amount of acid you’ll save is likely going to be rather noticeable. That said, we also don’t want users to go hog wild trying to hit a number, even though we know some have. Find a happy spot where your pH isn't drifting all over the place. Find a happy spot where you’re not adding acid all the time, and enjoy your pool.
 
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