Contech Engineered Solutions - Stormwater - Filterra® Biofiltration


Stormwater - Filterra ® Biofiltration Filterra is similar to bioretention in its function and application, but has been optimized for high volume/flow treatment and high...

Category: concrete biofiltration cells | filters | stormwater filters...

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Contech Engineered Solutions
9025, Centre Pointe Drive
West Chester, OH 45069
Tel: (800) 338-1122

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Stormwater - Filterra® Biofiltration

Stormwater - Filterra® Biofiltration

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 it to be used on highly developed sites such as landscaped areas, parking lots and streetscapes. Filterra is exceedingly adaptable and can be used alone or in combination with other BMPs.

Stormwater - Filterra® Biofiltration


Filterra – High Flow Rates, High Pollutant Removal

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

Third party field testing confirmed that Filterra meets state regulatory requirements for pollutant removal under TAPE and TARP testingRegulatory Compliance
Filterra offers the most cost effective stormwater treatment system featuring low cost, easy installation and simple maintenanceValue
Landscaping enhances the appearance of your site making it more attractive while removing pollutantsAdds esthetics to your site
Available in multiple configurations and sizes Flexibility to meet site-specific needs
No confined space access, and the first year of maintenance is included with the purchase of every systemSimple and easy maintenance


  • Inline
  • Offline
  • Roof Drain
  • Street Tree
  • Custom Configurations

Stormwater - Filterra® Biofiltration

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
Phosphorus Removal
Nitrogen Removal
Total Copper Removal
Dissolved Copper Removal
Total Zinc Removal
Dissolved Zinc Removal
Oil & Grease

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.

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)

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.


  • Low Impact Development, Green Infrastructure, and Environmental Site Design
  • High pollutant removal requirements
  • New construction and urban retrofits
  • Pretreatment for above-ground or shallow below-ground storage
  • Shallow, decentralized treatment

Stormwater - Filterra® Biofiltration

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.


Stormwater - Filterra® Biofiltration

Filterra Standard Offline

The Filterra Standard Offline configuration is the most economical and simplest Filterra configuration. It utilizes a downstream catchbasin or curb inlet for bypass flows allowing for the shallowest profile and most flexible design of any of the Filterra configurations. It is ideal for both new and retrofit projects.

Stormwater - Filterra® Biofiltration

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.

Stormwater - Filterra® Biofiltration

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.

Stormwater - Filterra® Biofiltration

Filterra – Street Tree

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

Stormwater - Filterra® Biofiltration

Filterra – Sediment Chamber

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

Stormwater - Filterra® Biofiltration

Filterra – Recessed Top

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

Contech Engineered Solutions
9025, Centre Pointe Drive
West Chester, OH 45069
Tel: (800) 338-1122
Web site:

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