Since my pool was opened, the CYA levels have dropped (unless the pool openers didn't add enough), thus my chlorine levels won't stay up.
Current levels as tested with TF-100 kit: (89 degrees)
FC - 2.5
TC - 3.0
CYA - 20
PH - 7.4
I dumped a gallon of Bleach 8.25% and a bag of shock in the pool...