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 How to Calculate BOD Removal Efficiency – Wastewater Math June 22, 2018 Pumps & Motors January 25, 2017 Problem Solved: Flow Rate Formula – Water Treatment, Distribution and Wastewater Math June 9, 2016 Post author: Post published:January 11, 2017 Post category:Certification Exams / Distribution / Water Treatment