While screening is an essential part of almost any treatment train, it is not, as a rule, an area that sparks enthusiasm. The success of a screen is not only in terms of its effectiveness in removing intended particles but in the support functions. The latter include cleaning of the screen; appurtenances for collection and removal of solids; having materials that are durable, strong, and noncorrosive; and providing a system that can be maintained easily. All of this is a part of screening technology that continues to be developed by proprietary companies. Consequently, the lore of screening technology is found primarily in the catalogs of manufacturers and is associated with some of the experienced personnel.