Water purification, process by which
undesired chemical compounds , organic
and inorganic materials, and biological
contaminants are removed from water.
That process also includes distillation
(the conversion of a liquid into vapour to
condense it back to liquid form) and
deionization ( ion removal through the
extraction of dissolved salts). One major
purpose of water purification is to provide
clean drinking water. Water purification
also meets the needs of medical,
pharmacology, chemical, and industrial
applications for clean and potable water.
The purification procedure reduces the
concentration of contaminants such as
suspended particles, parasites, bacteria ,
algae , viruses , and fungi . Water
purification takes place on scales from
the large (e.g., for an entire city) to the
small (e.g., for individual households..