Mam,

Asked by supriyaa.yn | 19th Aug, 2008, 10:33: PM

Expert Answer:

there are many methods by which the water gets purified few of them are reverse osmosis and uv light , reverse osmosis removes most of the impurities in the water where as in uv light irradiation micro-organisms like bacterias are killed.

Answered by  | 20th Aug, 2008, 07:27: AM

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