Environmental Engineering
Double filtration is used

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

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Environmental Engineering
Assertion A: Slow sand filters are more efficient in removal of bacteria than rapid sand filters.Reason R: The sand used in slow sand filters is finer than that in rapid sand filtersSelect your answer based on the coding system given below:

A is false but R is true
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false

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