CYA Test Question

[Michaelg90]

I’m testing my water this morning and doing a full round of tests. I took some photos of my CYA test because I’m stuck on what I should choose. Here are photos at levels 40, 30 and halfway between 30/20 which from my understanding would be rounded down to 20.

Thoughts? I’m leaning toward 30.

 

[Texas Splash]

Images are a bit tricky to view. I might go with 30 as well. If I stare hard enough though, I see the black dot in just about all of them. And I don't know about the lighting used. But try not to beat yourself up on this test too much. If it's sunny out, use the notes below to help. There's a 10-15% variance on this test, so you have some wiggle-room. You do want to ensure you have at least a CYA of 30 though.