Hey, recently purchased the Taylor K-2006 Complete (FAS-DPD Chlorine Test Kit).
Have tested my pool twice and I'm struggling w/ the CYA test. Specifically, the black dot never disappears.
As instructed, I fill the CYA dispensing bottle to the 7 mL mark w/ pool water and than add R-0013 to the 14 mL mark and mix for 30 seconds. The "mix" is pretty clear (is the R-0013 not working?) and as a result, the black dot, when I test, is always present.
FC = 0.5 ppm
CC = 1.0 ppm
pH = 7.8
CH = 110 ppm
TA = 80 ppm