this is my 5th year on BBB, so I feel fairly confident in what I am doing. I opened to a clear pool, did the prelim testing and my CYA was 10 (had the water in the house overnight so that the temp is around 72), which I totally expected, knowing my levels for the past couple of years and with the closing level being around 30.
Pool calculator said that I need 14 lbs of stabilizer, and I found 8 lbs at Walmart, dry stabilizer, 100% Cyanuric acid. I put the whole 8 lbs in a sock and waited about 10 days without backwashing or anything. Today I checked the CYA and it was 90. I checked it 3 times. Any idea as to what happened? I've never used stabilizer before, so this is a complete surprise.