List of chemicals typically used for treating turbidity table
Link to this table

Chemical Type Chemical Name Description
Polymers Chitosan Made from chitin. Rapidly binds to suspended sediment. Unlikely to adversely affect aquatic life.
Anionic Polyacrylamide (PAM) Synthetic polymer; includes a wide variety of chemicals based on acrylamide unit. Ensure that the product selected is anionic -- cationic products are toxic to aquatic environments. Flocculate should be removed via filtration or sedimentation.
Other additives Diallyldimethyl ammonium chloride (DADMAC) Positively charged monomer that binds negatively charged sediment particles into flocs. Can exhibit a strong aquatic toxicity.
Gypsum Naturally and widely occurring mineral made up of calcium sulfate and water.
Alum1 Aluminum sulfate material widely used in water treatment industry. Often more efficient than gypsum but can acidify treated water if overdosed.
Aluminum and iron chlorides1 Cations that bridge negatively charged sediment particles, causing them to coagulate and settle.

1Alum and aluminum and iron chlorides are also frequently used in Minnesota to coagulate soluble phosphorus out of stormwater and water bodies.