Mechanical Operations
For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.

Plate & frame
Rotary vacuum
Sand
Shell & leaf

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Mechanical Operations
Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for

German standard screens (DIN 1171) etc
American standard screens (ASTM and Tyler standard screens)
All of these
British standard screens

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