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) Pre-coated on the filter medium prior to filtration
(C) Separated from the cake by dissolving solids or by burning it off
(D) All A,
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