The screen is woven with metal wire or fiber wire, and the pore diameter is 0.15~1mm. It can remove and recover different types and small suspended solids, and screen separation has the advantages of simplicity, high efficiency and low operating costs. Generally used for small-scale wastewater treatment. There are many kinds of screens, the main two are vibrating screens and hydraulic screens.

The so-called screen is different from the general mesh product. Instead, there are strict series mesh sizes. And there are mesh products that meet the industry, institutions and standards for grading and screening of object particles. The screen does not talk about "mesh", "mesh" is just a habit for people to describe the screen, which is difficult to overcome for a while. The screen differs from the general mesh product in that it has a strict mesh size, not a "mesh number". The screen size is not isolated, it is composed of a series of mesh sizes, the purpose is for grading screening.