StormFilter is a stormwater treatment device comprised of one or
more structures that house rechargeable, media-filled cartridges that
trap particulates and absorb pollutants such as dissolved metals,
hydrocarbons, nutrients, metals, and other common pollutants found in
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
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.