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

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

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Environmental Engineering
Double filtration is used

For isolated buildings like pools, hotels etc swimming
To increase the filtration rapid sand filters capacity of
To increase the filtration slow sand filters capacity of
All of these

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