Thanks Watermom, that explains it! I added 8 lbs over 24 hours just to get some CYA in there due to the rapid decreases in FC. Didn't event think about checking the Ph. I thought Ph increases when chlorinating. Whoops. That is what I get for not keeping an eye on Ph.

I plan on adding more Borax today 1/2 a box at a time and see if I can get the PH up to something like 7.5. I worry about getting it too high. Since I am chlorinating with bleach I thought that increased the Ph.

I entered my data in the form. I will try to keep it up to date as I move forward.