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PerkFilter'" Media Filtration System <br />Description <br />The PerkFilter is a stormwater treatment device used to remove pollutants from urban runoff. Impervious <br />surfaces and other urban and suburban landscapes generate a variety of contaminants that can enter stormwater <br />and pollute downstream receiving waters. The PerkFilter is a media -filled cartridge filtration device designed <br />to capture and retain sediment, gross solids, metals, nutrients, hydrocarbons, and trash and debris. As with <br />any stormwater treatment system, the PerkFilter requires periodic maintenance to sustain optimum system <br />performance. <br />Function <br />The PerkFilter is a water quality treatment system consisting of three chambers: an inlet chamber, a filter <br />cartridge treatment chamber, and an outlet chamber (Figure 1). Stormwater runoff enters the inlet chamber <br />through an inlet pipe, curb opening, or grated inlet. Gross solids are settled out, and floating trash and debris are <br />trapped in the inlet chamber. Pretreated flow is then directed to the treatment chamber through an opening in <br />the baffle wall between the inlet chamber and treatment chamber. The treatment chamber contains media -filled <br />filter cartridges (Figure 2) that use physical and chemical processes to remove pollutants. During a storm event, <br />runoff pools in the treatment chamber before passing radially through the cylindrical cartridges from the outside <br />surface, through the media for treatment, and into the center of the cartridge. At the center of the cartridge is a <br />center tube assembly designed to distribute the hydraulic load evenly across the surface of the filter cartridge <br />and control the treatment flow rate. The center tube assembly discharges treated flow through the false floor <br />and into the outlet chamber. A draindown feature built into each cartridge allows the treatment chamber to <br />dewater between storm events. <br />Inlet c <br />Inlet <br />Precast concrete vault Filter cartridge treatment chamber <br />Bypass assembly Concrete talse door <br />Figure 1. Schematic of the PerkFilter system. <br />covers <br />hood <br />et pipe <br />A clear copy can be viewed at: <br />City of San Leandro, 835 East 14'h Street, City Hall, <br />San Leandro, CA 94577 <br />