Reason I ask is because I was testing a pool this weekend and if I swirled the small bottle I would get a reading of < 30ppm. Tried two separate tests (i.e. new reagent each time) and they both came back the same. I then redid the test but my son shook the bottle like you would a mixed drink and it came back with a reading > 40. Again I did it that way twice and both times were the same.
I have the K-2006 test kit by the way.
This happened by accident. I wasn’t trying to see which is correct. My 8 year old son just wanted to help and not telling him how to mix he just did it his way and thus the different readings.
So, do you swirl or shake the bottle for 30 seconds for an accurate test?