Sure enough, my LQ stopped up while I was gone for 5 days and I came home to a pool at 1ppm FC, 1ppm CC, and 40 CYA. The pool looks clear, but am I stuck with having to shock? I did increase the level tonight to a high level for my CYA level, but hoping I don't have to go through the whole process again.
I did find the culprit, it's the flow meter. I think I'm going to just remove it and adjust the flow by guess until it's keeping the FC correct.