You need to ascertain what is ...

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You need to ascertain what is causing the turbidity. Is it suspended material, colloids, or dissolved material as each can be the cause of turbidity? If it is suspended material then filtration using initial coarse down to finer filtration (to make sure each step doesn't blind) is the answer as per a previous comment. If it is colloidal or dissolved you will need to engage different methods, perhaps oxidation via chemical or coagulate or flocculate via chemical to achieve filterable material, then filter. Again it depends on what is causing the turbidity.