Stormwater media filters are used to treat a variety of pollutants at different source areas. These can range from being as simple rain gardens or biofilters containing soils or special media, to proprietary devices. Historically, sand filters and sand-peat filters were some of the earliest filters used for stormwater control. Austin (1988), Galli (1990), Shaver (1994, Claytor and Schuler (1996), and Urbonas (1999) all include descriptions and performance information for these fundamental stormwater filtration systems. These filters have been used to treat a variety of conventional stormwater pollutants, mostly focusing on suspended solids and nutrients. Continued research has examined additional media and expanded our understanding of stormwater media filters. Clark and Pitt (1999) include an extensive review of different media, designs, and expected performance. A large number of proprietary stormwater filters are also now available and usually include cartridges of specialized media that can target specific classes of stormwater contaminants. Descriptions of many of these devices have been described at technical conferences, especially the annual StormCon conference (http://www.stormcon.com/) where venders have extensive exhibits showcasing these filters. The International BMP Database has much data describing actual field performance for a wide range of stormwater filters (http://www.bmpdatabase.org/).