Filterra – High Flow Rates, High Pollutant Removal

Filterra is similar to bioretention in its function and application, but has been optimized for high volume/flow treatment and high pollutant removal. Its small footprint allows Filterra to be integrated into landscaped areas, parking lots, and streets on highly developed sites. Filterra is exceedingly adaptable and can be used alone or in combination with other BMPs.

How Filterra Works

Stormwater runoff enters the Filterra system through a curb-inlet opening and flows through a specially designed filter media mixture contained in a landscaped concrete container. The filter media captures and immobilizes pollutants; those pollutants are then decomposed, volatilized and incorporated into the biomass of the Filterra system’s micro/macro fauna and flora. Stormwater runoff flows through the media and into an underdrain system at the bottom of the container, where the treated water is discharged.


Filterra Features and Benefits

  • Regulatory Compliance - Third party field testing confirmed that Filterra meets state regulatory requirements for pollutant removal under TAPE and TARP testing.
  • Value - Filterra offers the most cost effective stormwater treatment system featuring low cost, easy installation and simple maintenance.
  • Aesthetics - Landscaping enhances the appearance of your site making it more attractive while removing pollutants.
  • Flexible – Multiple configurations and sizes available to meet site-specific needs.
  • Versatile - Filterra is ideal for both new construction and urban retrofits, as well as:
    • Streetscapes
    • Urban settings
    • Parking lots
    • Roof drains
    • Highways
    • Industrial settings
  • Easy Installation - Delivered on-site, ready to lift and place.
  • Maintenance - Maintenance is simple and safe (no confined space access), and the first year of maintenance is included with the purchase of every system.

Filterra Media – Proven Pollutant Removal

At the heart of all Filterra systems is Filterra engineered media; a specified gradation of washed aggregate and organic material homogeneously blended under strict quality controlled conditions. Using data from studies conducted by the University of Virginia, the filter media has been optimized to operate under high flow rates (100 to 140 inches/hour) while maintaining pollutant removal performance. Filterra media is tested for hydraulic functionality, fertility, and particle size distribution to ensure uniform performance.

Measured Pollutant Removal Performance
(Ranges varying with particle size, pollutant loading and site conditions)
TSS Removal 85%
Phosphorus Removal 70%
Nitrogen Removal 43%
Total Copper Removal 58%
Dissolved Copper Removal 46%
Total Zinc Removal 66%
Dissolved Zinc Removal 58%
Oil & Grease 93%

Information on the pollutant removal efficiency of the filter media/plant media is based on third party lab and field studies.
Some jurisdictions recognize higher removal rates - see your Contech Stormwater Consultant for details.

Filterra media also supports a vegetation component consisting of flowers, grasses, a shrub, or a tree that assist with adsorption of pollutants biological uptake/ storage and microbially-mediated transformations.

Installation and Maintenance

We make it easy for you...

  • Vegetation selection guidance based on your climate zone.
  • On-site planting and activation included with every system.
  • The first year of maintenance is included with the purchase of every system.
  • Ongoing maintenance is simple.
  • - Clean biofiltration bay with simple landscape tools (rake and shovel).
  • No confined space entry required.
  • - Everything can be accessed from the surface.

To view documents simply click on (+) before the folder to view contents, then double click document file to open. For Standard Details on vault sizes not listed below please contact your Contech Stormwater Design Engineer.

Filterra is offered in multiple configurations to meet site specific needs. These configurations make Filterra the most versatile decentralized stormwater BMP line on the market.

Filterra Internal Bypass – Curb
The Filterra Internal Bypass – Curb incorporates a curb inlet treatment chamber and internal high flow bypass in a single structure. This eliminates the need for a separate bypass structure and enables placement on grade or in a “sag” or “sump” condition.

Filterra Internal Bypass – Pipe
The Filterra Internal Bypass – Pipe treats piped in stormwater runoff from rooftops. Higher flows bypass the bioretention treatment via an overflow/bypass pipe design.

Filterra  – Street Tree 
The Filterra Street Tree contains openings in the concrete vessel for root expansion of trees with larger root balls.

Filterra – Sediment Chamber
The Filterra Sediment Chamber includes a sediment chamber that provides a settling area for large debris and sediments.

Filterra – Recessed Top
Filterra recessed tops allow a seamless integration using pavers, Mulch, or sod. Recessed tops increase the depth of the invert out.

Regulatory Approvals

Based on more than 20 years of research and development, testing, and field monitoring, Filterra’s performance has been recognized by some of the nation’s most significant regulatory agencies. Filterra is the only manufactured treatment device:

  • Granted ESD (Environmental Site Design) status by the state of Maryland Dept. of Environment (MDE).  In fact, Filterra’s performance is recognized by MDE as superior to even their own public-domain micro-bioretention systems in their stormwater manual.
  • GULD-approved for ALL pollutants of concern with the state of Washington Dept. of Ecology (WA-Ecology). 
  • The most third-party-protocol tested, with (1) TARP, (2) TAPE, (1) NJCAT and (1) NCDENR tests completed

Filterra has achieved the following State approvals:

Virginia: Since 2002 (TARP)
Maryland:              Since 2002 (only MTD as ESD Practice)
Washington:            Since 2006 (TAPE – only MTD on ALL pollutants)
Massachusetts:         Since 2008 (TARP - MASTEP)
New York:              Since 2009
Maine:                 Since 2009 (TARP & TAPE)
TCEQ (Texas):          Since 2010
ODOT (Oregon):         Since 2010
OR DEQ UIC Program:    Since 2011
Pennsylvania:          Since 2012 (TARP)
Delaware:              Since 2013
Georgia (ARC):         Since 2013
New Jersey & D.C.: Since 2014 (NJCAT)

Bioretention Case Studies
Prairie Line Trail
Prairie Line TrailTacoma, Washington
SouthfieldSouth Weymouth, Massachusetts
Capitol Highway
Capitol HighwayPortland, Oregon
Grande Dunes
Grande DunesMyrtle Beach, South Carolina
Pentagon Secure Bypass
Pentagon Secure BypassArlington, Virginia
Home Depot
Home DepotWilliamsburg, Virginia
Marina Del Rey
Marina Del ReyLos Angeles, California
Port of Tacoma
Port of TacomaTacoma, Washington
Grand Boulevard
Grand BoulevardVenice, California
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