Page 418 - Primary Six Notes

Water Impurities

Impurities are contaminants or foreign objects in water. Water

impurities make it unsafe for use. Impurities may be organic

or inorganic soluble or insoluble.

Inorganic impurities

It consists of dissolved mineral salts which make water unsafe

to use.

Organic impurities

These include bacteria, fungi and protozoa. Others may be

dead plant materials such as leaves and grass.

Examples of water impurities

 Human wastes e.g. urine, faeces, etc.

 Animal wastes like urine, dung

 Silt from erosion -

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 Herbicides -. rÿ'

 Insecticides

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