From http://www.swimmingpoolsteve.com/page... Learn how much of each of the most common chlorine products need to be added to swimming pool water. New pool owners just want to know one cup or one gallon? There are calculated amounts used to raise chlorine levels and you need to know the volume of your pool and how much of your preferred chlorine product is used to raise that much water by 1 ppm. Add that amount until you have a chlorine level in the appropriate range of 35ppm. This video discusses measurements for liquid chlorine (sodium hypochlorite), Cal Hypo (calcium hypochlorite), and Dichlor (DichloroSTriazinetrione).