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Which of the following is correct regarding the cheapest filter material used in water treatment?

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+1 vote
in Environmental Engineering by (81.4k points)
Which of the following is correct regarding the cheapest filter material used in water treatment?

(a) Sand>Anthracite>Garnet sand

(b) Sand<Anthracite>Garnet sand

(c) Sand<Anthracite<Garnet sand

(d) Sand=Anthracite>Garnet sand

The question was asked in an interview for internship.

I'm obligated to ask this question of Filter Media in section Filtration of Environmental Engineering

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Best answer
The correct option is (a) Sand>Anthracite>Garnet sand

The explanation is: Sand is the cheapest filter material followed by anthracite whereas Garnet sand is the costliest among them and is not used as a sole filter material but as a constituent in mixed media filter.

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