Definition of sand filter
A filter for purifying domestic water, consisting of specially graded layers of aggregate and sand, through which the water flows slowly downwards. A similar type of filter is used for treating sewage effluent, but has coarser sand.
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Locality Updated: Ciapa Liscia, Piacenza Province, Emilia-Romagna, ItalyFrom Bruno Marello, 10th Dec 2013 10:45:58