which regions are rich in material which is used in water purifier system (fine sand;coarse sand and gravel)
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Explanation:
Sand Filter
Sand filters range in size from very large tanks or boxes used for municipal water treatment to small portable vessels used in swimming pools.
From: Food Process Engineering and Technology, 2009
Related terms:
Activated CarbonBackwashingPretreatmentReverse OsmosisFilter BedFiltration RateSlow Sand Filter
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