Mechanical Operations
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

All of these
Added to the feed slurry
Precoated on the filter medium prior to filtration
Separated from the cake by dissolving solids or by burning it off

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Mechanical Operations
In case of grinding in a ball mill

Wet grinding achieves a finer product size than dry grinding
Its capacity decreases with increasing fineness of the products
Grinding cost and power requirement increases with increasing fineness of the products
All of these

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