Quote Originally Posted by JimK View Post
My apologies for the side track, but I don't remember reading before that CYA cannot be checked at high CL levels. How does CL affect the CYA test? What's considered "high"?

Thanks.
Hey JimK. Yeah, sorry I should have qualified that as a personal preference. The Tatlor website lists no official interferences for that test but I tried the CYA test several times at 30ppm FC and got a value that was 30ppm lower than at Target FC levels. My pH at that time was above 8.0 as well so I just decided that it was a bad idea to attempt those tests during any kind of shock procedure.

I am open to persuasion that it was operator error, but I repeated the test about 5 times and I got the same results. I appreciate a possible chemical explanation but I never got one.