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The effective size of sand particles used in slow sand filters is
The rate of filtration in slow sand filters in million litres per day per hectare is about
Cartridge filters are termed as 'edge' filters, because of the fact that the
In slow sland filters, the turbidity of raw water can be removed only up to
I have never seen such a slow coach like you, this small work has taken you three full months.-What does the idiom' a slow coach' mean?
I've never seen such a "Slow coach". Slow coach means ---
I've never seen such a "slow-coach" like you. Here "slow-coach" means ---
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about
Air binding phenomena in rapid sand filters occur due to
The yield of a rapid gravity filter as compared to that of slow sand filter, is