In the evenings when you test and before you add bleach, how low has your chlorine dropped? Are you able to go from sundown one day until sunup the next day without losing more than 1ppm of chlorine?
One other thing you may not know. If you get a CYA reading of 100, it actually could be much higher than 100 since the test kit can't differentiate past that level. You need to be keeping your chlorine between 8-15 ALL the time. Since yours has dropped below that range, you could have an algae bloom that is trying to start. I think it might be wise for you to go ahead and shock your pool up to 25 and maybe squash any algae bloom that may be trying to start.

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