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Granular filtration

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[[Image:granular high density carbon.jpg|thumb|right|350px|Granular, high-density carbon.]]

In water treatment, granular filtration is a process where water flows through granular material (often sand) while suspended solids (sand, clay, iron and aluminum flocs) are retained, substances are biochemically decomposed and pathogenic microorganisms (bacteria, viruses, protozoa) are removed.

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