hello again pool gurus...i know my question has probably been answered a million times but after spending some time searching old posts in the forums, i'm not finding it. i need to know how many ppm constitutes "shock level". i'm just getting started and my fc is at 1 ppm / tc is at 3 ppm - so if i'm doing the tests right, that makes my cc at 2 ppm. i read where if cc is above .5, i need to shock. so... what is the "shock level"???? i'm using bleach. thanx much.