Stormwater Treatment for the Most Challenging Pollutants
StormFilter is a stormwater treatment device comprised of one or more structures that house rechargeable, media-filled cartridges that trap particulates and absorbs pollutants such as dissolved metals, hydrocarbons, nutrients, metals, and other common pollutants found in stormwater runoff.
The siphon actuated, high surface area cartridges draw stormwater evenly through the filter media, providing efficient, effective stormwater treatment. The unique surface cleaning mechanism prevents surface blinding, ensuring maximium media contact, and prolongs cartridge life.
The structures that house the StormFilter cartridges can be configured in a variety of ways to accommodate a wide range of flows, project specific footprints, and variable hydraulic conditions.
The filter media in the StormFilter cartridges can be customized to target site-specific pollutants. For example, in applications targeting phosphorus, Contech developed PhosphoSorb®, a unique filter media designed specifically for applications targeting high levels of phosphorus removal.
The StormFilter is available in multiple cartridge heights to meet site-specific hydraulic needs and is available in different upstream configurations including downspout, catch basin, curb inlet, linear grate, infiltration, and dry well.
StormFilter has been extensively tested in the field and laboratory, and is performance verified by both the State of Washington Department of Ecology and New Jersey Department of Environmental Protection, as well as numerous other stormwater regulatory agencies. With over 120,000 worldwide installed cartridges, and twenty plus years of sustained performance, StormFilter is equipped to handle the most challenging stormwater scenarios.
How the StormFilter Treats Stormwater
- Stormwater enters the StormFilter through the inlet pipe.
- Stormwater passes through the filtration media and begins filling the cartridge’s center tube.
- When water nears the top of the cartridge, the float valve opens, and filtered water is allowed to drain at the design flow rate.
- A one-way check valve then closes, activating a siphon that draws polluted stormwater evenly through the filter media and into the center drainage tube.
- Filtered water then discharges out of the system through the under drain manifold.
- When the water level outside the cartridge approaches the bottom of the hood, air rushes through the scrubbing regulators, releasing the water column and breaking the siphon.
- The turbulent bubbling action agitates the surface of the filter media, promoting trapped sediment to drop to the vault floor. This patented surface cleaning mechanism helps restore the permeability of the filter surface between storm events.
StormFilter Features and Benefits
|1. Siphon actuated, high surface area media cartridges
||1. Stormwater is drawn evenly through the filter media providing efficient, effective stormwater treatment
|2. Surface cleaning mechanism
||2. Prevents surface blinding, ensures use of all media, and prolongs cartridge life
|3. Multiple media choices
||3. Customized media options target TSS, phosphorus, heavy metals, and hydrocarbons
|4. Multiple cartridge heights
||4. Flexibility to meet site-specific hydraulic needs
|5. Refillable media cartridges
||5. Easy maintenance and low life-cycle cost
|6. The only stormwater filter with performance verified by both the WA DOE and NJ DEP
||6. Superior pollutant capture with confidence
The StormFilter has been verified by some of the most stringent stormwater technology evaluation organizations in North America, including:
- Washington State Department of Ecology
- Jersey Department of Environmental Protection
- Maine Department of Environmental Protection
- Maryland Department of the Environment
- North Carolina Preliminary Evaluation Period
- Texas Commission on Environmental Quality
- St. Louis Metropolitan Sewer District
- PhosphoSorb® - A lightweight media built from a Perlite base that removes total phosphorus (TP) by adsorbing dissolved-P and filtering particulate-P simultaneously.
- Perlite - Expanded volcanic rock. Its porous, multi-cellular structure and rough edges make it effective for removing TSS, oil, and grease.
- CSF® Leaf Media and Metal RX™ - A granular organic media created from deciduous leaves, CSF is most effective for removing soluble metals, TSS, oil, and neutralizing acid rain. MetalRx, a finer gradation, is used for higher levels of metal removal.
- Zeolite - A naturally occurring mineral used in a variety of water filtration applications, is used to remove soluble metals, ammonium, and some organics.
- Granular Activated Carbon - A micro-porous structure with an extensive surface area to provide high levels of adsorption. It is primarily used to remove oil and grease and organics such as herbicides and pesticides.
- ZPG™ - A proprietary blend of zeolite, perlite, and GAC to improve the performance of perlite and target organics, soluble metals, and other pollutants.
- Vault, manhole, volume, peak diversion
- Catch basin, curb inlet, linear grate
- Infiltration well/dry well
- Roof runoff - downspout
- Commercial and residential development, infill and redevelopment and stormwater quality retrofit applications
- Highways, airports, seaports and military installations
- Pretreatment for Low Impact Development, infiltration, and rainwater harvesting and reuse systems
- All StormFilter structures provide access for inspection, media replacement, and washing of the structure.
- StormFilter has been designed for predictable maintenance intervals ranging from 1 to 3 years.
- Contech’s Cartridge Replacement Program provides refurbished cartridges that are shipped to your site ready to install. Contech arranges for empty cartridges to be picked up and shipped back.
- Vacuum extraction of captured pollutants in the vault is recommended at the same time.
- Contech has created a network of Certified Maintenance Providers to provide maintenance on stormwater BMP’s.