Filter and fluid characteristics related. For example, fluid viscosity, and chemical / ionic components, the greater the viscosity of the fluid flow rate under the same conditions of pressure the slower, there is greater contact between the fluid and the membrane, better filtration; Again, the mixing of the fluid film and / the contact time also have a greater impact on the filtering effect, the longer the mixing / contact time the filtering effect is better. In addition, note that the characteristics of the fluid affects only rejection membrane adsorption effect of the fluid without affecting the particle size exclusion. Filter particulate filter effect type and have a great relationship, deformable particles into non-deformable particles and two kinds of particles. Under a certain pressure, the deformable particles into the filter membranes which will result in more clogging of the filter, which could affect the filtering effect, such as a gel filtration. However, another layer of cake immutable objects when the particulate filter is formed on the filter. Filters with the actual operating conditions such as flow rate and pressure of the filter particles. To get a good filtering effect, generally choose lower lower flow rate, the flow rate of rejection better. Practice has proved that the structure of the mobile membrane filtration is unfavorable, once the structure of the film has changed in the filtration process, the particles and fibers depth filter can be precipitated from affecting the filtering effect. However, the speed / pressure adsorption interception only to have a major impact on the size excluding the impact is relatively small.