20K gallon, gunite / plaster pool, 2.5hp pump, sand filter. I use trichlor tabs supplemented by bleach during swim season.
Current readings are FC 3.5, CC 0, pH 7.6, Alk 100, Cal 170 and cya < 20 (all measured using PS233 kit).
The pool remains a bit cloudy (hard to distinguish items on the bottom of the pool). I flocked and backwashed with no change (and didn't really expect one).
I believe my FC is too low, and cya too low as well. So I added about 1.5 lbs of CYA into the skimmer and broadcast about 2 lbs of 48% cal-hypo granules into the pool.
Am I on the right track?