image of filter strip
The vegetated filter strip in this photo is pretreatment for a bioswale. Photo courtesy of Alisha Goldstein, U.S. EPA.

Filtration pretreatment practices include proprietary and non-proprietary devices that remove particles by filtration or sieving through media (gravel, sand or other), vegetation, geotextile or fabric material, metal or plastic screen, or other material. The filtration devices presented here are classified as pretreatment due to the nature of the filtration, placement in the treatment train, or built-in additional pretreatment mechanisms. The filtration methods are widely varied from biological to mechanical. They seek to remove not only larger sediments and debris, but also heavy metals, nutrients, and other fine contaminants. The natural or engineered biological systems are, by nature, above ground.

This page provides links to pages addressing pretreatment filtration practices.

This page was last edited on 8 February 2023, at 16:51.