In short, the more parameters, the better, which is beneficial to the selection of the pump. The pump can transport various fluid media, as well as highly viscous media, media containing solid particles, and media containing fibers. For example, ordinary medium sewage and high sludge content, the packing seal form is directly selected, which has good abrasion, easy replacement and low price.. Sealing methods are divided into mechanical seals and packing seals.

Good adjustment performance and high Grinder Sewage Submersible Pumps efficiency. It is widely used in various industries such as sewage, medicine, daily chemical, papermaking, printing, and food. The mechanical seal has a good seal, but it is expensive.　　Single screw pump provides on-site use medium (viscosity of medium, if medium is sludge, provide content) temperature, flow and pressure when selecting with supplier.

The cost is lower than that of a screw pump. When the medium requires no leakage, the mechanical seal should be used. It is also convenient to replace accessories later. If the flow required on site is small, it is recommended to use a mechanical diaphragm metering pump.　　Secondly, after these parameters are determined, the sealing method of the pump is determined according to the medium used on site.　

Single screw pump is a type of positive displacement pump.The above sewage pumps or screw pumps are only made of metal (cast iron, stainless steel), so they are not suitable for some corrosive sewage containing solid particles (when stainless steel is not suitable).In the environmental protection industry or various sewage treatment, sewage pumps play an increasingly important role.