In slow sland filters, the turbidity of raw water can be removed only up to
A. 60 mg/litre
B. 75 mg/litre
C. 100 gm/litre
D. 150 mg/litre
Answer: Option A
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In rapid sand filter its 35 to 40 ppm and in Slow sand filter its 50ppm .
but slow sand filter might not be used if turbidity is greater then 50ppm
In Rapid Sand filter how Much?