cyanuric acid levels

Hello, First I want to say thanks to this community as it helped me maintain a crystal clear pool last year. I just opened the pool on Wednesday and it was a mess of dark green sludge. I measured my numbers with my test kit and the CyA was zero. I realize now I probably should have corrected...

I slammed my pool two weeks ago after some minor algae flair-ups. Before slamming, I brushed the pool vigorously, vacuumed extensively, and cleaned my DE filter the following day. Two weeks later, the pool is crystal clear, and the FC and TC are 3.0 ppm and 0, respectively. However, my cyanuric...