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Different from all conventional filtration and microfiltration (both are static filtration), ultrafiltration has a small separation diameter and can almost trap all bacteria, viruses and colloidal particles, proteins, organic molecules in a solution. Secondly, the entire filtration process is carried out in a dynamic environment, and the solvent only get partial separation. Driven by pressure difference between two sides of the membrane, feed solution entering ultrafiltration components can in part get through the membrane and become ultrafiltrate, while the rest become concentrated liquid that continuously flows out, so that the material which cannot penetrate the membrane  can only accumulated to some extent on the membrane surface. In the steady state, the filtration rate can reach an equilibrium value without continuous decay, and the entire process can be long lasting.