Good questions.
I think pink means you don't have a lot of calcium. And I've noticed it turns more purple than blue. Maybe old reagents?
The CYA test takes practice. You should face into the sun with the vial at your waist level. The GOOD thing about the test is you can keep repeating it without using more chems. Just pour the solution from the black-dot vial back into the squeeze bottle and try again. Do it as many times as you need till you get a feel for it! I ALWAYS do it at least twice, sometimes 3x. It only takes another minute.
Another thing is always try to do the test EXACTLY the same way each time, especially when you do it on a different day. You'll figure it out with practise.
Bookmarks