UPDATE:
Opened the pool for the first time since Sunday evening. Crystal clear water (I was concerned) I ran tests: (I haven't received my borate test strips yet.)
FC -1.5
cc- less than .5
ph- 7.3
temp -81
cya - under 50
TA - 160
More rain is forecast, so I added a bottle of bleach and closed it back up.

I'm no chemist, but I'm a believer in borates.