The type of nylon filter mesh you require depends on the type of application. You can find different configurations of the mesh available, in various sizes. The sizes you will need to determine include the mesh opening and the length of the actual mesh. The opening size is influenced by the size of the thread used and the mesh count.
Your Nylon Filter Mesh Opening Is Too Big When It Is Not Filtering Out Particles
You can have problems removing small particles from liquids when the openings in nylon filter mesh are too big. Instead of preventing the particles from passing through the mesh, they are able to fit through the opening. To remedy this situation, you should obtain filter mesh with a smaller mesh opening. You may even want to consider using multiple meshes in different sizes, to remove as many particles as possible.