Environmental Engineering
The polluted water is one which

Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated
Is safe and suitable for drinking and domestic use

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Environmental Engineering
The major disadvantage of lime soda process of water softening is that

It is unsuitable for softening the water of excessive hardness
It is unsuitable for turbid and acidic water
The effluent cannot be reduced to zero hardness
Huge amount of precipitate is formed which creates a disposal problem

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