A little while back, as part of another thread, I seem to temper a sidebar discussion about reading the CYA test, comparison to the known sample, etc. I don't remember what the root thread was so I can't find it to find out what the outcome was.
My wife and I read the CYA results differently. Her eyes are better than mine. I 'see' (pun intended) it disappear at a higher value than she does (i.e. at a lower fill level on the column). But it is the most variable of the tests, at least to my thought process. I've always been 'concerned' about overshooting CYA and having to partial drain to resolve. We are typically about 10ppm different. I also have variability just reading the test in different days in the 'same' conditions.
Does anybody remember what happened in that thread? Or a reference to it?
My only concern is I read it as 70 and she reads it as say...40. That would be a huge FC difference and easy to go under the target in Texas August sun loads.