Thanks everyone! I meant Cyanuric Acid, sorry! Yes, our pool looks beautiful, just checking to see what others thought. I really haven't used any charts, and should. I just eyeball, and check the levels often. Put liquid chlorine in, that is what we use. Than I use the Muractic Acid to reduce PH, when it needs it. I have to reread things on here to see what levels are the best. I was looking at my book. thanks