Once the raw water reaches our plant, it is treated with ferric sulfate. After raw water is fed with ferric sulfate, it goes to rapid mix. The rapid mix gives enough time for the raw water and the ferric to mix properly. The purpose of this process is to remove particulate impurities, especially non-settleable solids and color from treated water. A coagulant aid (Polymer) is also used to assist the process as needed. Caustic (Sodium Hydroxide) is also used for pH adjustment when needed.