In practice, the single most critical problem limiting the application of membrane processes for liquid separation is fouling [1]. The flux decline which accompanies fouling affects the operational reliability and economics in microfiltration, ultrafiltration, and reverse osmosis [1]. Fouling occurs predominately on the membrane surface due to the deposition of one or more system constituents including organics, sparingly soluble inorganic salts dissolved in the feed stream, and colloidal and/or paniculate matter. In addition, a gel layer can be formed from organic molecules in the system due to concentration effects adjacent to the membrane surface and compaction can occur when the operating pressure causes a decrease in membrane thickness. Although the occurrence of fouling is often inferred from a time-dependent decline in flux, the interpretation of results in such studies is complicated by the fact that during operation gel formation and compaction as well as fouling may all occur simultaneously [2]. Since each of these processes can produce a flux decrease [3], it is often impossible to distinguish the particular combination of phenomena associated with an observed overall flux decline [1, 4].