OK, I'm a doofus. I went to the pool store today to talk about the differences in their/my cya readings and the clerk pointed out to me that the scale on the sample tube was inverted. Soooo this means they were correct and my cya is over 400. The dot disappears about a third of the way up to 100. Given the logarithmic type scale I can only imagine it is actually over 400.

I'm going to bite the bullet and drain the pool. It was drained once before to have it re-plastered and didn't float so I'm hoping I can do it again. Any precautions?? I've found a way to use the pool pump to drain it. Anything I should be aware of before I start? Thanks kevin