I know I'm missing something that is very simple, but I'm confused.

How do I figure PPM. I test my Chlorine and it is 3.0 and the PH is 7.8 on my indicator. I don't think I can figure CYA with the kit I have. (I know I need the other kit and it's on the list) I read that if I am going to "shock" my pool it need to be so many PPM. What's the difference and how do I figure it.

I'm trying to get the green out of my pool an overdose in bleach. Since Sunday morning I have added 6 gallons of 6% bleach.