I just finished my pool build (well its swim-able) and it just finished filling from well water today. 2 days total fill time. Pump and filter came online a few hours ago. While filling I used the Pool Calculator to adjust chlorine to shock levels each evening. Last evening and this evening the levels have been below detection with the TF-100 kit prior to adding bleach. There is no FC or CC. I have not yet added any CYA but plan to do so tomorrow. There is a lot of what looks like rust that has collected on the bottom of the pool. The cleaner is blowing that off the bottom tonight so hopefully it will be clean and ready to swim tomorrow.
Is it normal for the chlorine to drop to zero from 10ppm in 24 hours? What is causing it? Sun? Iron?
PH is 7.5 as far as I can tell.