DOMESTIC WATER TREATMENT
Standards for drinking water:
(i) It must be colorless and odorless.
(ii) It must have a good taste.
(iii) It must not be hot.
(iv) The turbidity must be less than 10 ppm.
(v) It must be free from dissolved gases like H2S.
(vi) It must be free from objectionable minerals like Pb, As, Cr, Mn etc.
(vii) The alkalinity must be low. The pH must be about 7·0?8·5.
(viii) Hardness, should be less than 550 ppm.
(ix) It must be free from disease producing micro-organisms.
(x) The concentration of chlorides, fluorides and sulphates must be less than 250, 1·5 and 250 ppm respectively.
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