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Turbidity
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===Reagents=== There are a number of [[chemical reagent]]s that are available for treating turbidity. Reagents that are available for treating turbidity include [[aluminium sulfate]] or [[alum]] (Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>Β·nH<sub>2</sub>O), [[ferric chloride]] (FeCl<sub>3</sub>), [[gypsum]] (CaSO<sub>4</sub>Β·2H<sub>2</sub>O), poly-[[aluminium chloride]], long chain [[acrylamide]]-based [[polymer]]s and numerous proprietary reagents.<ref>Earth Systems, Clear Solutions newsletter - Focus on Turbidity [http://www.earthsystems.com.au/wp-content/uploads/2012/02/ClearSolutions_No1_2003.pdf] 2003.</ref> The water chemistry must be carefully considered when chemical dosing as some reagents, such as alum, will alter the [[pH]] of the water. The dosing process must also be considered when using reagents as the [[Flocculation|flocs]] may be broken apart by excessive mixing.
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