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The coarser layer used in a dual media filter is of __________

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+2 votes
in Environmental Engineering by (81.4k points)
The coarser layer used in a dual media filter is of __________

(a) Sand

(b) Anthracite

(c) Garnet sand

(d) Rice husk

The question was asked in semester exam.

My question comes from Dual Media and Mixed Media Filter topic in portion Filtration of Environmental Engineering

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Correct answer is (b) Anthracite

The best I can explain: Anthracite is a coarser filter medium used in the dual media filter. It is costlier than sand and it is used as a substitute for sand.

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