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Filters are rated according to their ability to remove particles of a specific size from a fluid suspension. There are many different methods in which performance may be specified in this way, and quantitative information as to filter performance must always be associated with the corresponding test methods used.

The object of a filter is to remove solid particles from a fluid stream either completely, or at least down to a specific size. Apart from specially prepared test suspensions, most real suspensions contain a wide range of particle sizes and the actual
efficiency of removal is then a compromise between the amount of solid allowed through the filter and the energy required to capture the rest (i.e. the fineness of the medium, which dictates the energy consumption by the filter, and hence a large part
of the operating cost).

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