I've been using a Taylor K-2006 kit for several weeks now, and I just noticed that I get consistent results when I do multiple FC/CC tests even though I'm doing the tests right after each other, and I'm using the same spot in the pool for the water (which is as far out and as deep as I can reach in the mid-deep area. I would ignore a 0.1 or 0.2 ppm difference, but I'm seeing a full ppm difference sometimes. I'm following all the instructions carefully, and everything seems "normal" other than the fact that one test will indicate (for example) 2.2 ppm FC, a second test 3.0 ppm, and a third 3.2 ppm. I'm also noticing a less dramatic (yet still somewhat troubling) difference in CC -- anywhere from 0 to 0.6 ppm or so on any given test.
Is this normal? What could explain this?