According to Taylor you want to achieve Breakpoint chlorination (10 x the CC level) any time your CC reaches .2ppm I have been trying this at .5ppm and it seems to be working ok. I really don't think of it as "shocking" the pool when I'm only raising it to say 7ppm when I have a cc of .5 but I guess technically it is. My normal target range is 5-9 so you see I can achieve Breakpoint as a matter of my normal maintenance. Just another way of saying the same thing as the others perhaps.