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
Greater than that of rapid sand filters
Less than that of slow sand filters

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Environmental Engineering
The polluted water is one which

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

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