Naturally available water, after having come in contact with various salts found in soil stratas and atmosphere, contains a large number of chemicals. Some of them are calcium, magnesium, potassium, sodium, iron, sulphates, nitrates, nitrites, phosphates and oxygen. Small quantities of these substances are responsible for the taste and odour of natural water and are useful for essential functioning of the human body. Very small quantities of copper, chromium, chlorine, fluorine, arsenic, lead, cadmium, mercury and selenium are also found, depending upon the chemistry of the soil.
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