Dow™ ultrafiltration is a membrane separation technology. The process is based on the principle of mechanical sieving, driven by the pressure difference on both sides of the membrane, to separate solutions. The retention of substances involves not only sieving but also physicochemical interactions such as adsorption, repulsion, and bridging. In the field of water treatment, it can be used to remove particles, colloids, bacteria, viruses, pyrogens, proteins, and high-molecular-weight organic matter from water, thereby purifying it.