Im new at testing chemicals so here it goes. Two nights ago we started the BBB as we just filled our pool. I have started with dichlor in the appropriate amount for the last two nights. I've been testing chlorine and ph nightly. Not sure if I'm supposed to check the cya yet or after the fourth night. So I just tested it and my question is about the black dot on the bottom of the test tube. Does it visibly go away from waist level? It never looked like it did but if I held it just in front of my eye, the blot dot was faded in the middle but not the edges. What should I be expecting with this? Thank you so much.