ABSTRACT
As a technology, rapid filtration has evolved from a variety of proprietary innovations in the 1880s and as an empirical practice from about 1900 through perhaps the 1980s. By the mid 1980s, process theory started to influence design and operation. The process, called depth filtration, has to do with the removal mechanisms of particulates being transported to the granular media comprising the filter bed and attaching to its surface, thereby being removed from the fluid flow.
