If memory serves, a CC number can be affected by other things. Unfortunately, I can't remember what all those other things are. Certainly a bad test kit solution, or sloppy test methods. But I seem to recall a CC test can show a false number if other things are present in the water. TFP experts, can you help me jog my ol' brain about that?This turned out to be a bad plan. I've brought 4.5 weeks of SLAM to an end. Between chlorine and test kit refills I've spent pool store money and my CC is still consistently >0.5. I'll try again this winter when I'll lose less chlorine to sun and the everything is done dropping leaves in the pool.