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Design Stage

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The patented screening system suspended above the sedimentation chambers, captures and stores trash and debris in a dry state. Dry state storage of trash and debris minimizes nutrient leaching, bacterial growth, bad odors, and allows for an easier removal.

NSBB During storm

During Storm Events

  • Filtration Screen – Collects and Stores Trash, Debris, Organics, and Oxygen Demanding Substances Above Standing Water in a Dry State.
  • Turbulence Deflectors – Prevents Re-suspension of Captured Pollutants.

Trash, debris, and organics are captured in the filtration screen as sediments settle to the bottom chambers. Hydrocarbons are removed and absorbed by the boom.

NSBB Between Storm events

Between Storm Events

  • Sediment Chambers – Maximizes TSS Removal and Eliminates Scouring During Extreme Flow Rates.
  • Skimmer & Boom – Collects Hydrocarbons and Controls Flow Velocity which Improves Removal Efficiency.

Trash, debris, and organics are stored in a suspended screen system allowing pollutants to dry out between storm events. This eliminates septic conditions and prevents leaching of plant-based organics into water.


Pre-treatment and diversion eliminate the need for a separate diversion structure. The NSBB’s patented deflector shield system allows the system to be installed inline and provides the unique advantage of providing both pre-treatment and low flow diversion for above ground and underground infiltration basins.


TSS Removal 87%

Phosphorus Removal 70%

Oils & Grease Removal 99%

Copper, Lead & Zinc Removal 98%

Bacteria Removal 68%


California Water Boards

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San Francisco Estuary Partnership

No Letter

Univeristy of Massachusetts

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NSBB Maintenance
  • No Confined Space Entry is Required for Servicing
  • Cleaning can be Accessed through Manhole or Hatch above Ground with Vac Truck
  • Separating Pollutants Minimizes Costs – Screen System Allows Gross Solids to be Removed without Vacuuming out Water or Sediment Chambers
  • Screen Systems are Hinged for Easy Access to Sediments Collected in Lower Chambers


  • Low Pick Weights: Delivered in a Top & Bottom to Minimize Weight
  • 1 Hour Set Time: Internal Components are Installed Prior to Delivery
  • Minimal Excavation: Bottom of Structure Less than 4ft. from Invert of Pipe
NSBB Installation

Pricing Stage

Request a Quote

Design Stage

Design Request

Learn more Stage

Request A Lunch & Learn

Project Profiles

Get clear examples of how this stormwater product will perform in the field and meet immediate engineering challenges, stormwater needs and regulations. Here are Bio Clean stories.

  • Manchester Retrofit Community Park

    Manchester Retrofit Community Park

    PROJECT: Manchester, Washington Stormwater Retrofit Community Park LOCATION: Manchester, WA PRODUCTS: Modular Wetlands’ MWS Linear & Bio Clean Nutrient Separating Baffle Box (NSBB) COMPANY: Bio Clean and Modular Wetlands Introduction Kitsap County saw an opportunity for a grand [Read more]

  • Solana Beach Elementary, Stormwater Project

    Solana Beach Elementary, Stormwater Project

    Balfour Beatty Construction, Bio Clean Combine Resources To Provide Cost-Effective School Solution Initially established in the 1930’s and consisting of one classroom on five acres of Old Solana property, the Solana Beach School District now [Read more]

  • Sunnyside Lake Tahoe, Stormwater Project

    Sunnyside Lake Tahoe, Stormwater Project

    West Sunnyside Erosion Control Nutrient Separating Baffle Box Restoring Clarity to Lake Tahoe The Situation Lake Tahoe, CA – Lake Tahoe Basin was geologically formed about two million years ago. Over time, snowmelt from the [Read more]