How can we find if the water is fresh or dirty without using a microscope?

To test the water is fresh or dirty without using a microscope:

Take a beaker, funnel and filter paper. Put the filter paper on the funnel. Place the funnel with filter paper on the beaker. Pour the water on the funnel containing filter paper and keep it aside for five minutes. Later if you observe any dust particles on filter paper then the water was dirty water or else it was fresh water.

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