Quote Originally Posted by rkelly View Post
. I usually did every Sunday night using shock. need to

Remember, shock is something you do TO your pool, not an ingredient you put in it. If the "shock" you're talking about is pre-packaged dichlor, then I would stop using it, because everytime you use it, it raises your CYA....it won't be long before you're going to have to up your base chlorine level to compensate for the higher CYA levels. That's one of the problems with the pool-store version of shock--they sell you packaged "shock", which raises CYA, which raises base chlorine requirements, but they don't tell you that--so when your pool gets cloudy and green because the chlorine is too low, they sell you more "shock", and raise the CYA further. After several cycles of this, people usually find their way to this forum and realize that the "shock" they keep adding is the problem. (It also contributes to low pH problems). If you'll use bleach or liquid chlorine both for shocking and for regular chlorination, it will not drive up your CYA,will not drive down your pH, and will save you lots of time and aggravation in the long run!

Janet