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A bucket of turbid river water does not ...

A bucket of turbid river water does not become clear even on standing for a long time. Why? How can you make this turbid water clear? Explain.

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Turbid water is a colloidal system in which clay particles remain dispersed with a size lying within `10^(-7)-10^(-4)` cm. Since colloidal particles possess Brownian motion, they do not settle down due to gravity. The dispersed clay particles in turbid water are negatively charged. The turbidity of the water can be removed if the suspended clay particles in it are coagulated. This is usually done by adding alum to turbid water. `Al^(3+) and K^(+)` ions of alum neutralise the charges on the clay particles, thereby causing them to get precipitated. The water obtained after the precipitation of clay particles appears clear
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