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How is filtration rate and cake depth determined?

Filtration rate is controlled mainly by the product’s physical characteristics so the particle shape, cake porosity, and compressibility need to be taken into account.

These characteristics are not easily measured, so tests must be run to measure their effect on pressure drop, filtration rate, and cake depth. As a general rule, the minimum allowance for cake depth is three inches and the minimum cake buildup rate is 1 inch per hour, giving you a minimum filtration rate of 4 liter/min-M² (0.1 gpm/ft²).