From pool school regarding CYA
For the full story readSolid stabilizer can take up to a week to fully register on the test
Basically my parents hired some people to open my pool. Pre-open CYA was 0. I don't know what they used to shock it, but assume (due to some educated guessing) there was CYA in it. They worked on it Monday, I retested the water again this afternoon and CYA was still at 0. My question is should this gradually appear in testing? Or would it all appear at once?