Thanks for your responses. As Jason suggested, last night I tested chlorine levels again, and came up with:
FC 8
CC 1
TC 9
I added 3 gallons of bleach. Two hours later, the readings were:
FC 18
CC 1
TC 19
This morning (Wednesday) at 7:00 am, readings were:
FC 17
CC 1
TC 18
PH 7.6
ALK 70...