UV Systems is a pressure driven membrane separation process that separates particulate matter from soluble components in the carrier fluid (such as water). UV Systems has larger pores than nanofiltration and reverse osmosis. UV Systems is a low-pressure membrane process used to separate high molecular weight compounds from a feed stream. Typically, UV Systems will remove high molecular-weight substances, colloidal materials, organic and inorganic polymeric molecules Low molecular-weight organics and ions such as sodium, calcium, magnesium chloride, and sulfate are not removed. Because only high-molecular weight species are removed, the osmotic pressure differential across the membrane surface is negligible.