Environmental Engineering
The alum, when added as a coagulant in water

Does not require alkalinity in water for flocculation
Decreases pH value of water
Increases pH value of water
Does not affect pH value of water

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Environmental Engineering
Double filtration is used

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

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