Environmental Engineering
The rate of Alteration of pressure filters is

In between the filtration rate of slow sand filters and rapid sand filters
Equal to that of slow sand filters
Less than that of slow sand filters
Greater than that of rapid sand filters

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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
To increase the filtration rapid sand filters capacity of
All of these

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