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im- Removal of any turbidity and/or colour(dispersa), bacteria and other finely divided mather from the water Approach- Adding a precipitate- eliminating electronic charge () of particles- water is stirred- small particles stick together to form bigger particles Create particle sizes (density) for a general elimination by- better sedimentation or- filtration Precipitates widely used- Iron (III) hydroxide- Aluminium hydroxide Process- adjusting (if necessary) the pH of thewater to above 7- by adding lime or sodium hydroxide- adding a solution of an iron (III) compound such as iron (III) chloride- Iron (III) hydroxide is extremely insoluble- forms even at a pH as low as 7
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