There are different methods for removing impurities from liquids. The most common is using various filtration methods. The level of filtration and type used often depends upon the application, function and industry. For instance in waste water treatment, particles and impurities are removed from water in several stages, including running water through polyester mesh.
Use Different Sizes of Polyester Mesh for a Multistage Filtration System
A multistage filtration system can use several different sizes of polyester mesh. The openings at each stage will gradually become smaller and smaller. The reason for this type of setup is to make sure that particles of all different sizes are properly removed. If just a single smaller size were used, it would quickly clog up, as both large and small particles would block the flow of liquid. By using several stages, larger particles are removed first, followed by the next size, and so on, all the way down to the smallest size mesh being used.