The following characteristics pertain to the sand filters used in water industry. 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. 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. Which of the above characteristics pertain to slow sand filters ?

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