I have an FC overnight loss of 1.5. The night before last was 1.5 loss as well.
I was expecting this morning's test to show 0 to 1 loss, but no. So to me, it looks like there's still a little bit of algae, that somehow didn't die. I have kept my chlorine at shock level, (except for sunlight loss because my pool gets full sun) and I have been scrubbing! Is there something I'm missing? (Maybe just POP!)