The only dumb question is one that is not asked. Therefore ... the following:
The same chemicals are used in the Lamotte "black dot" CYA test and my brand new TF100 test kit. However the instructions to mix are different. Lamotte "black dot" CYA test says to shake the mixing vial for 1 minute, let set for 3-5 minutes, shake once, and then read in the viewing tube. TF100 says to mix, wait at least 30 seconds, shake once more and then read in the view tube.
I am a recent convert to the TF100 and am having difficulty with the CYA "black Dot" test. I am following the TF100 instructions but have always had trouble with the "black dot" test.
Question: Are the TF100 instructions all I need (except experience) to conduct a reliable CYA "black dot" test?