Hi again, Yes, I did look over the chlorine chart, and it makes sense. I'm not sure I understand the difference between the two "shock" columns. Looks like I need to get out to buy some more shock. Did I read in another forum that some people use regular unscented chlorine bleach instead of paying for shock? I'm assuming you need to use more due to the smaller amt of active ingredients.
One question I have is about CYA levels is the relationship between CYA levels, total chlorine levels and free chlorine levels. When CYA levels are closer to "normal" is there less of a spread between total and free chlorine levels?
Also, how long does stabilizer levels take to rise after addition to the pool?

P.S. one more name for stabilizer - clarifier.