I don't always test my CC's. I check FC level more often than CC. I test for CC's once or twice a week. When you have CC's the chlorine is working on something in the water. If you always keep FC in range for your CYA level you'll be good.
CC of 0.5-0 is good. CC of one or more needs to be addressed.
CC of 0.5-0 is good. CC of one or more needs to be addressed.