Jellyfish® Stormwater Treatment

Jellyfish® Stormwater Treatment

The Jellyfish Filter is a stormwater quality treatment technology featuring high flow pretreatment and membrane filtration in a compact stand-alone system. Jellyfish removes floatables, trash, oil, debris, TSS, fine silt-sized particles, and a high percentage of particulate-bound pollutants; including phosphorus, nitrogen, metals and hydrocarbons. The Jellyfish Filter has been tested in the field and laboratory, and is approved by the Washington State Department of Ecology (TAPE) GULD – Basic, Phosphorus, as well as numerous other stormwater regulatory agencies.

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The Jellyfish filter - Setting New Standards in Stormwater Treatment

The Jellyfish Filter is a stormwater quality treatment technology featuring high surface area and high flow rate membrane filtration at a low driving head. By incorporating pretreatment with lightweight membrane filtration, the Jellyfish Filter removes a high level and a wide variety of stormwater pollutants. The high surface area membrane cartridges, combined with up-flow hydraulics, frequent passive backwashing, and rinseable/reusable cartridges, ensure long-lasting performance.

How the Jellyfish Filter Treats Stormwater

  • Stormwater enters the Jellyfish through the inlet pipe or inlet grate, builds driving head, and traps floating pollutants behind the maintenance access wall and below the cartridge deck.
  • Water is conveyed below the cartridge deck where a separation skirt around the cartridges isolates oil, trash and debris outside the filtration zone, allowing sand-sized particles to settle in the sump.
  • Water is directed to the filtration zone and up through the top of the cartridge into the backwash pool. Once the water has filled the backwash pool, clean water overflows the weir where it exits via the outlet pipe.
  • The membrane filters provide a very large surface area to effectively remove fine sand and silt-sized particles, and a high percentage of particulate-bound pollutants such as nitrogen, phosphorus, metals, and hydrocarbons while ensuring long-lasting treatment.
  • As influent flow subsides, the filtered water in the backwash pool flows back through the hi-flo membrane cartridges into the lower chamber.  This passive backwash extends cartridge life, keeping the membrane clean for future events.
  • The draindown cartridge(s) located outside the backwash pool enables water levels to balance.

Jellyfish Filter Features and Benefits

Features Benefits
High surface area membrane filtration Low flux rate promotes cake filtration and slows membrane occlusion
High design treatment flow rate per cartridge (up to 80 gpm (5 L/s)) Compact system with a small footprint, lower construction cost
Low driving head (typically 18-21 inches or less
(457-533 mm))
Design Flexibility, lower construction cost
Lightweight cartridges with passive backwash Easy maintenance and low life-cycle cost

Jellyfish Filter Performance Testing Results

Pollutant of Concern % Removal

Total Suspended Solids (TSS)


Total Phosphorus (TP)


Total Copper (TCu)


Total Zinc (TZn)



WA DOE TAPE Testing: ecy/ezshare/wq/tape/use_designations/ JELLYFISHfilterIMBRIUMguld.pdf

Select Jellyfish Filter Certifications

  • Washington State Department of Ecology (TAPE) GULD – Basic, Phosphorus
  • New Jersey Corporation for Advanced Technology (NJCAT)
  • Virginia Department of Environmental Quality (VA DEQ)
  • Texas Commission on Environmental Quality (TCEQ)
  • Canada ISO 14034 Environmental Management - Environmental Technology Verification (ETV)
  • Philadelphia Water District (PWD)
  • Maryland Department of the Environment (MD DOE)
  • Virginia Department of Environmental Quality (VA DEQ)


Jellyfish Filter Configurations

The Jellyfish Filter can be can be configured in a variety of systems; manhole, catch basin, vault, or custom configuration.  Typically, 18 inches (457 mm) of driving head is designed into the system. For low drop sites, the designed driving head can be less.

Jellyfish Filter Maintenance

  • Jellyfish Filter cartridges are lightweight, easy to use, and reusable
  • Maintenance of the filter cartridges is performed by removing, rinsing and reusing the cartridge tentacles.
  • Vacuum extraction of captured pollutants in the sump is recommended at the same time.
  • Full cartridge replacement intervals differ by site due to varying pollutant loading and type, and maintenance frequency.  Replacement is anticipated every 2-5 years.
  • Contech has created a network of Certified Maintenance Providers to provide maintenance on stormwater BMP’s.

Technical information for this product is located in the technical guide’s section. 

View Technical Information
Pretreatment for LID Designs

The Stormwater Management StormFilter, Jellyfish Filter, and the High Capacity Kraken Filter can be easily configured as decentralized pretreatment systems for Low Impact Development Designs. 

Filtration Systems for Water Quality

The Stormwater Management StormFilter, Jellyfish Filter, and the Kraken Filter provide the highest level of treatment and meet the most stringent regulatory requirements. These low maintenance systems combine pretreatment and filtration, and are able to target site-specific pollutants to meet your water quality goals. Our field-proven products have earned hundreds of standalone BMP approvals from regulatory agencies nationwide.

Filtration for Removing Pollutants Prior to Discharge

Media filtration systems - like our StormFilter, Jellyfish Filter, and Kraken Filter are able to remove the most challenging pollutants from stormwater, including total phosphorus, soluble metals, oil, and very fine particles. Available in a variety of configurations (vault, manhole, catch basin, high flow and volume), these systems can be engineered to treat a wide range of flows within your drainage system and capture pollutants prior to discharge off-site.

High Volume Applications

Designing, manufacturing and installing high-volume stormwater detention and treatment systems requires expert engineering, planning, and logistical support to manage costs and keep the project on schedule and under budget. When you need a proven, large scale stormwater management system, “Go Big” with Contech.

The Contech Advantage

Agency/Regulatory Guidance

Our team is ready to provide you with expert advice and assistance on local regulatory requirements, resulting in faster approvals.


Solution Development

Our engineers can review your requirements, weigh all options, and recommend the optimal solution to integrate with your site designs.

Technical Expertise

Our engineers can assist by providing product specific engineering calculations such as hydraulics, buoyancy, foundation reactions, and unit sizing.

Cost Estimates

We can quickly provide engineer’s cost
estimates to assist with your solution
selection process.

Site Specific Drawings

Our engineers can provide site-specific drawings for proposals, project meetings, and submittals, helping you be more efficient with your time.

On-site Assistance

Contractors know time is money, so we provide preconstruction meetings, delivery coordination, and on-site installation support to ensure a timely, smooth installation.