Ok, now I'm confused. The OP said they are adding what PoolCalculator says to add to get up to shock level according to the CYA in the pool. An hour later, the test shows lower chlorine levels. I thought that was what happens with SLAMming when there's algae or something organic in the water. And continually adding bleach, waiting for it to mix (which also let's it oxidize and get used up), re-testing and re-adding is what results in SLAMming eventually getting the water clear.
This seems to be what the SLAM process says to do--help me understand where I'm going wrong...
This seems to be what the SLAM process says to do--help me understand where I'm going wrong...