I am not sure what you read about not doing 2 things on the same day. You can make most adjustments within a few minutes of each other.
The CYA should be added to a sock and put in the skimmer. It may take up to a week to fully dissolve and show up on the test. Just squeeze the sock occasionally.
The CYA should be added to a sock and put in the skimmer. It may take up to a week to fully dissolve and show up on the test. Just squeeze the sock occasionally.