Slow sand filtration is a biological, physical and chemical purification process. As the water flows through a porous filter-bed, its quality improves considerably by reduction of the number of micro-organisms, viruses, protozoa, turbidity, heavy metals, organic matter, iron and arsenic.
Slow sand filtration is a biological, physical and chemical purification process. As the water flows through a porous filter-bed, its quality improves considerably by reduction of the number of micro-organisms, viruses, protozoa, turbidity, heavy metals, organic matter, iron and arsenic.
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