How does pressure increase the rate of filtration?

In filtration, a fluid must overcome the resistance of a filter medium to pass through it. This process requires a driving force, which can be provided by gravity, centrifugation, or the application of pressure.1

Applying pressure to the fluid above the filter—or creating a vacuum below it—increases the rate of filtration by providing the necessary force to push the fluid through the medium more efficiently than gravity alone. In industrial settings, this application of pressure or vacuum is essential not only to accelerate the process but also to reduce the size of the equipment required for the operation.1

Furthermore, in processes like reverse osmosis, the application of pressure is used to force a solvent through a semipermeable membrane against a concentration gradient, effectively filtering out solutes and impurities. In the case of gases, pressure is similarly used to force the medium through thick filters to ensure effective particle removal.23