Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

[A].	added to the feed slurry.
[B].	precoated on the filter medium prior to filtration.
[C].	separated from the cake by dissolving solids or by burning it off.
[D].	all 'a', 'b'&'c'.

Answer: Option D

Explanation:

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