Don't test for at least a week, and don't backwash for several days to a week. The CYA is in the filter most likely.....is yours sand?

Don't do what I did 2 years ago, opened to a green swamp which gobbled up my CYA, cleaned up mess, then added the appropriate amount of CYA, tested 2 days later and still no CYA. Went back to the pool store and said hey, my CYA didn't budge? They promptly sold me another jug and had me add. My CYA was 90 at the end of this process. Oh, I was still using pucks (not hockey) at the time.

CaryB
Will Canada's current hope win the Cup? Or will it stay down here in USA?