As you can see in my signature, I use the K-2006 kit. For testing FC and CC, I use the FAS-DPD test. I have a question about the CC test. It says after adding 5 drops of R-0003, if the sample turns pink, add R-0871 until it turns clear again. Every time I run this test, the sample turns the very slightest of pink. You can barely see the pink. One drop of R-0871 easily turns it clear. It seems to me that the CC is closer to 0 than to 0.5ppm. Should I be recording this as 0.5ppm as I have in the past? I have not been running the 25ml test but it wouldn't surprise me if I got a 0.2ppm result.