This equipment adopts dissymmetrieal semipermeable film which is made from macromolecule material with special process. When the raw liquid flows under pressure, it flows inside or outside the film. The macromolecule substance and colloid particles in the raw liquid are clogged at the film surface and are brought away by circulating raw liquid. Then the raw liquid becomes inspissated, and further more, the substance in liquid is separated, concentrated and purified.
