Is it normal for the testing never to get to really clear? Seems at higher FC levels the best I get is a grey solution with bits of black floating in my 10 ml sample. Definitely starts red, but never goes clear. this doesn't happen when I was testing at levels FC 3-5 ppm, just during slam. Using speedstir, also.
Never finding any CC's either in testing, adding 5 drops to the grey solution doesn't turn red at all.
Are my results normal?