It is probably time to do a quick water testing review. When testing FC and CC, it is important that the sample go completely clear at the end of the FC portion of the test, before you start the CC portion of the test. Sometimes the sample can turn a very pale pink that looks almost clear. If you stop at that point, you can get a CC reading that is higher than the actual CC level. Now that the CC level is fairly low, the sample should stay clear for nearly a minute, so there should be time to look carefully to be sure that it is completely clear.