We have an auto cover and I hadn't opened the pool in a week. So, when I opened it, I noticed cloudy water like the start of an algae bloom. I tested the water and it showed 0 chlorine. So, I shocked and adjusted the SWCG up. A couple of days later, checked again and find 1.2 chlorine and 0 stabilizer. My stabilizer was at approx. 40 prior to this. I know we've had some splash-out (and one of my 2 year olds adjusted the valve on the filter and pumped about 15% of the pool water out), but I didn't expect it to be 0. The stabilizer I had used was a year old...any chance it went bad? I'm going to shock again and get the stabilizer level up, but I am curious as to why that happened. I think my TA is a little high also, but not sure how that might affect anything.

Levels as of today:
Chlorine: 1.2
Stabilizer: 0
pH: 7.4
TA: 250