6. Water treatment - World Health Organization
Treatment system amoebas worm Cercaria Fe, Mn Fluoride Arsenic Salts taste matter Turbidity Rapid sand filtration The sand used is coarser than ☺☺☺☺☺☺———☺☺☺☺ in slow sand filtration and the flow rate is higher. The method is used to remove suspended solids and is effective after the water has been cleared with
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