How much liquid chlorine do I need to raise my pool's chlorine level by 1 ppm?

One quart of 10% liquid chlorine raises a 10,000-gallon pool by about 1 ppm. For any pool, multiply your pool volume in gallons by the desired ppm raise, divide by 10,000, then divide by your chlorine strength as a decimal. For example, a 20,000-gallon pool needing a 2 ppm raise requires two quarts of 10% liquid chlorine.