I checked CYA yesterday afternoon and had to do it twice to make sure I saw it right. First time it read 40 second 35, I guess there was already some in there from when I did the original test last week (user error on the test, it was cloudy outside). Good thing I only added enough CYA to raise it 20ppm and not 30ppm. With that said I've adjusted my chlorine as required for my SLAM with 40ppm CYA.
Would his chlorine burn off faster though if he didn't raise it to 20?
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You are correct. Look at what he posted above though. That is what I thought would happen. He had some CYA in the water so I wanted to make sure he did not raise it too much. It turned out just right.
Kim