Water supply facilities obtain water either from groundwater sources or froma variety of surface water sources, including lakes, rivers, wells and the sea.Water usually has to be purified and, if it is taken from the sea, desalinated.Processes to remove contaminants from drinking water: Filtration,sedimentation and disinfection. Ion exchange and adsorption may also beenapplied. In some cases, groundwater is of such good quality that notreatment at all is required. Most water utilities choose a combination oftreatment processes, depending on the quality of the water.
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