Did review my spreadsheet. I did a total of 5 rounds of 72oz Dichlor to raise the CYA which measured zero with K2006 when I started with the Dichlor. The ColorQ showed very low CYA numbers and the high one was an user error (test tube rotated 90 degrees). When measuring the CYA with ColorQ the test tube actually became smooth "blurry" as in previous measurements the crushed tablet didn't really dissolve. The one time I did measure the FC in the evening and in the morning the Dichlor added 9PPM of FC. So my best guesstimate CYA would have been in the low forties (In my previous post I thought that I only added 4 rounds of 72oz of Dichlor).

Thanks, for reading.
Ernst