Back in the day when I was having CYA troubles, the strips told me my CYA was 30-50.
In reality it was well over 100. Strips are notoriously inaccurate.
The cc number is important because that will tell us if you need to shock more or if the cloudy could be from something else, or it's just dead algae that needs to filter out.
You really need to be sure that your CYA is accurate, but either way 1pmm chlorine is too low for a cya of 40.
See the cya/chlorine chart for your target levels, use the pool calc for dosing, and get yourself a TF 100 test kit.
Hope this helps.