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Question 9 In a filtration plant, water is filtered using layers of (a) sand and clay (b) clay and fine gravel (c) sand and fine gravel (d) sand, fine gravel and medium gravel

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Question 9

In a filtration plant, water is filtered using layers of
(a) sand and clay
(b) clay and fine gravel
(c) sand and fine gravel
(d) sand, fine gravel and medium gravel



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