I have been asked to look after my friends pool when they saw how mine looked using this great website. I totally drained it as as the CYA was 200 ppm. Anyway pool is refilled and here are my latest results. This pool is 20000 gallons, vinyl lined with a 1.5 kripsol pump. I am using a Pool Exact EZ photometer tester.
The water is lovely and clear but is using quite a lot of chlorine (strength is only 4%) Should CC be 0 or are the results OK?