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A steady flow of fluid through a filter will cause correspondingly steady accumulation of solids and rise in pressure drop. The effect of pulsating flow is to loosen the finer particles held in the filter cake, and so to allow them to pass through the filter
and on into the filtrate. This effect is illustrated in Figure 1.13, which shows the higher particle counts downstream of the filter in pulsating flow, as compared with steady flow. This is another instance of the departure of the real filter system from
the performance achieved with the same filter under laboratory conditions. Clearly, the likelihood of irregular flow must be allowed for in the initial selection process, such as choosing a finer filter from the start, in order to achieve the required filter
efficiency.

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