Filterra® Bioretention Systems Approved by Washington State Department of Ecology for General Use Level Designation

By: Filterra  09-12-2011
Keywords: Stormwater Management, Stormwater Treatment

Filterra receives TAPE/GULD approval for TSS, Oil and Grease and Enhanced Dissolved Metals

December, 2009 - The Washington State Department of Ecology (DOE) has now approved the Filterra® Bioretention System for General Use Level Designation (GULD) for TSS, oil and grease, and enhanced dissolved metals. This new state approval recognizes Filterra as a proven, effective solution to mitigate unwanted pollutants from stormwater runoff.

Washington Study Findings of Fact for Test Sites

  • TSS removal was >80% for concentrations >20mg/l
  • Dissolved Zinc removal >54%
  • Dissolved Copper removal >40%
  • Total Petroleum Hydrocarbon removal 93%
  • Infiltration rates up to 133 in/hr were observed

The Filterra Bioretention System is an advanced high-flow stormwater treatment technology that combines landscape plants with an engineered filtration media to effectively capture and remove stormwater runoff pollutants, such as trash and debris, oils and grease, sediments, nutrients, metals and bacteria prior to discharging treated runoff into waterways; protecting the environment, local fisheries and recreational waters.

Based on more than 20 years of research and development in bioretention testing and field monitoring, Filterra has gained state level approval of this technology for stormwater management projects in Washington. The Filterra system has no moving parts or special components to replace. Unlike end-of-line treatment systems, it treats smaller drainage areas closer to the source of pollutants. Easy to design and install, the Filterra system requires simple annual maintenance and can be strategically placed into existing landscape designs, making it an attractive solution for new construction and retrofits.

Keywords: Stormwater Management, Stormwater Treatment

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Unit dimensions listed on all Filterra documents (plans, drawings, Engineer Design Assistance Kits, sales sheets, etc) refer to the internal dimensions of the Filterra unit. When water flows into the Filterra system “head-on” it may cause system damage and may eject collected trash back into the parking lot or roadway.