Thanks Waterbear!

That's what I thought about the bleach, but I want to make sure I ask all the questions (even dumb ones ) so that I get this right! My SWCG is a Pentair Intellichlor Model IC 40. I checked the manual and it does say that optimum CYA levels for the unit are 50-80 ppm. Why should I aim for the manufacturer's high end? I appreciate the education.