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 Chemical Solutions August 2, 2016 How to Calculate Chlorine Pounds Per Day – Distribution Math July 5, 2017 Water Main Installation January 29, 2017 Post author: Post published:January 11, 2017 Post category:Certification Exams / Distribution / Water Treatment