I got most of it at Walmart, but 4 lbs of it at a pool store.
Last night I put 6 gals of bleach in which should have brought it up to 12
I forgot to test it last night, but my # now are
FC 3
CC .5
TC .5
PH 7.5
ALK 120
Cal 110
CYA 0

I am thinking I have something growing that is possibly eating the CYA when it runs out of Chlorine. I read somewhere on here that can happen over the winter. Can it be happening now too????

I am off to get more bleach and stabalizer now. How much CYA do you think I need for my pool?? I am guess ing I have 30-35,000 gals. Does that sound right??