I just opened:
FC = 0
CYA = less than 20, perhaps even 0.
TA = 60
CH = 80-90
The same thing happened last year where I have no CYA, but last year I had CCs so I slammed, assuming it converted to ammonia.
The water is clear. Should I go ahead and adjust CYA to 30 and then add bleach to target 3, or should I just go ahead and SLAM anyway since it's just being opened?