The only adjustment to TA that I'm familiar with is to subtract 1/3 of the CYA value from the test results. This is sometimes referred to as CYA corrected TA. Usually this "correction" comes into play when discussing the Saturation Index, and even then it is debated as to whether the correction is appropriate. This site usually doesn't put a lot of merit in the saturation index unless you're running a heater. I usually keep my CYA low enough that the correction is not significant one way or the other.
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