DisinfectionAddition of chlorine to water until the chlorine demand has been satisfied. At this point, further additions of chlorine will result in a free chlorine residual that is directly proportional to the amount of chlorine added. By jay@americanwatercollege.org | January 18, 2017 | Certification Exams . Wastewater Treatment . Water Treatment | Tags: Breakpoint Chlorination, Certification Exam Prep, Disinfection, Distribution System, Wastewater Treatment, Water Treatment