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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. [Wrong Answer] |
B. | precoated on the filter medium prior to filtration. [Wrong Answer] |
C. | separated from the cake by dissolving solids or by burning it off. [Wrong Answer] |
D. | all 'a', 'b'&'c'. [Correct Answer] |