The following characteristics pertain to the sand filters used in water industry. Filtration rate is 1 to 4 m3 (m2 day).Typical duration of operation in one run is 24 to 72 hours.Operating cost is low. Which of the above characteristics pertain to slow sand filters ?

The following characteristics pertain to the sand filters used in wate

1.	The following characteristics pertain to the sand filters used in water industry. Filtration rate is 1 to 4 m3 (m2 day).Typical duration of operation in one run is 24 to 72 hours.Operating cost is low. Which of the above characteristics pertain to slow sand filters ?
A.	I, II and III
B.	I and II
C.	II and III
D.	I and III
Answer» E.

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The following characteristics pertain to the sand filters used in water industry. Filtration rate is 1 to 4 m3 (m2 day).Typical duration of operation in one run is 24 to 72 hours.Operating cost is low. Which of the above characteristics pertain to slow sand filters ?

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