If the sulfur is entering ...
Published by Terry Scheurman, President at Applied Specialties, Inc.
If the sulfur is entering your system as sulfate, you are having reduction occur within the system. If the sulfur is entering your system as sulfide, you are having oxidation occur. These are polar opposites so you must identify the influent S form 1st. Chances are it is Sulfide and you are oxidizing it. That is the most common cause of elemental sulfur. Extremely difficult to stop the reduction at the S stage. Just run ORP's across your system.