Modular Wetlands Linear


The Modular Wetlands® Linear is the only biofiltration system to utilize patented horizontal flow, allowing for a smaller footprint, higher treatment capacity, and design versatility. It is also the only biofiltration system that can be designed downstream of storage for additional volume control and treatment.

Also known as: Modular Wetlands®, Modular Wetlands® System Linear, Modwet™, or MWS Linear™


  • Horizontal flow biofiltration
  • Greater filter surface area
  • Pretreatment chamber
  • Patented perimeter void area
  • Flow control
  • No depressed planter area
  • Auto draindown means no mosquito vector

Learn More About the Modular Wetlands

Our local stormwater experts come to you!

Modular Wetlands, often considered the most trusted standard for stormwater compliance, uses a smaller footprint yet provides more treatment surface area. It is the only stormwater biofilter using horizontal flow which improves performance and minimizes maintenance. Request a Lunch & Learn today, and get regionally-focused insight and solutions from a local Bio Clean stormwater expert.


Washington State Department of Ecology

Virginia Department of Environmental Quality

Massachusetts Stormwater Technology Evaluation Project

Rhode Island Department of Environmental Management

Texas Commission on Environmental Quality

California State Water Resources Control Board

Maryland Department of the Environment – Environmental Site Design (ESD)

Atlanta Regional Commission


Modular Wetlands Linear has been successfully used on numerous new construction and retrofit projects. The system’s
superior versatility makes it beneficial for a wide range of stormwater and waste water applications.

Industrial Sites

Parking Lots
Mixed Use

Low Impact Development
Waste Water

System Operation


Larger trash and sediment is trapped in the pretreatment chamber as the system's pre-filter boxes filter out finer pollutants.


Water leaves the pre-filter and enters the biofiltration chamber, filling the void space and filtering inward towards the vertical drain pipe.


In the discharge chamber, the flow control riser and the orifice plate control the flow of water through the media. Extending maintenance life and improving performance.


In a side-by-side unit, the pretreatment and discharge chambers are adjacent. Another unique advantage of horizontal flow.


Total Suspended Solids (TSS) 85%
Total Phosphorus 64%
Ortho Phosphorus 67%
Motor Oil 95%

Modular Wetlands Linear
Presentation Video


This presentation focuses on the technical advantages of the Modular Wetlands Linear which is known for using a smaller footprint while providing even more treatment surface area. It is the only stormwater biofilter using horizontal flow which improves performance and minimizes maintenance. Learn more!


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