Why is vacuum filtration sometimes preferable to ordinary gravity filtration?

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Why is vacuum filtration sometimes preferable to ordinary gravity filtration?

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Vacuum filtration is often faster than gravity filtration and is most useful if the solid must be kept or if a filtration must be done rapidly. A vacuum from an aspirator or a vacuum pump is used to pull the liquid through a funnel containing a piece of filter paper, while the solid is left on the paper.

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