Corrosion Control If sequestration of iron and manganese is practiced, the chlorine residual in the water system should always be maintained at or above: Tags: Certification Exam Prep, Chlorine Residual, Distribution System, Iron, Manganese, Sequestration, Water Treatment Read more articles Previous PostWater Treatment and Distribution System Next PostWater Treatment and Distribution System You Might Also Like Disinfection January 30, 2017 How to Calculate Chemical Pounds Per Day Formula – Distribution September 13, 2017 Arizona Water Operator Certification Reciprocity June 18, 2018 Post author: Post published:January 11, 2017 Post category:Certification Exams / Distribution / Water Treatment