Hello to all,
I helped perform all the tests w Tf-100 & magnetic stirrer.
Re CYA, I performed the normal pool water to bottom label, agent to top label, shake & wait 30 sec’s, shake again, have back to sun and hold tube down to waist. It was definitely a 110 when the dot was gone.
The OP had a pool guy using pucks as Marty noted. I recommended 3ft drain which is close to 1/2 depth, but suggested to post results on TFP to gain a consensus. By draining 1/2, it would lower CYA, TA & CH. We tested City water and I believe it was 150ppm.
If you feel it’s mandatory to perform a diluted CYA test, pls post process and OP can perform. I’ll assist if needed.
Thanks for everyone’s help & advice,
tstex