Pool volume is about 33,000 gallons. Added CYA to the skimmer and have not backwashed, did that the day before adding it. I know they often do things wrong, but this store is fairly good. The setup is they have a testtube that is sealed from the factory for each test. They then pipet the water in and insert the tube in a colorimeter - so no highschool dropout is trying to read colors - its all machine read. So, I will go with your guess that it is not fully dissolved yet.

The pool is looking much better. It is mostly clear in the shallow end and only slightly green tinted in the deep. But the rate of improvement has dropped. There is no slipperyness on the wall or floor.