I was in the pool for my daily therapy, and needed to do my monthly testing.
When I got to the CYA test, I tried something a little different. As I was pouring the mixture into the test cylinder, the bottom half of the cylinder was in the water. I came up with 40 ppm that way, so tried it again (same sample) with the cylinder out of the water. Same result. Repeated several times. It appeared to be easier to read with the bottom of it in the water, allowing the light to enter it from all directions.
Has anyone else tried this? If so, what are your findings?