Im doing the CYA test for the first time. I know to watch for the black dot to disapear. But should it be completely gone or just starting to disappear. If i can just barely see it then its not disapeared yet. Ive done the test a couple of times and im getting different readings. First time 60 second time 40. Yesterday i added enough syabalizer to get me up to 50 according to pool math.