The StormFilter is a passive, siphon-actuated, media-filled filter cartridge that traps and absorbs particulates and pollutants.
During a storm, runoff passes through the filtration media and starts filling the cartridge center tube. Air below the hood is purged through a one-way check valve as the water rises. When water reaches the top of the float, buoyant forces pull the float free and allow filtered water to drain.
After the storm, the water level in the structure starts falling. A hanging water column remains under the cartridge hood until the water level reaches the scrubbing regulators. Air then rushes through the regulators releasing water and creating air bubbles that agitate the surface of the filter media, causing accumulated sediment to drop to the vault floor. This patented surface-cleaning mechanism helps restore the filter’s permeability between storm events.
Storm water enters the sedimentation basin, below the filter deck, through the inlet pipe. Floating pollutants (debris, oil and grease) rise to the filter deck where they are trapped by the cartridge hoods above the cartridge bottom. A significant portion of the total suspended solids settles to the bottom of the basin through gravity separation.
Pre-treated storm water enters the cartridges and passes through the filter media where fine particulate material is captured. Treated water is discharged through the cartridge onto the top of the filter deck where it exits through the outlet pipe.
Flows exceeding the water quality design flow of the VortFilter will discharge through the stand pipe that extends through the filter basin deck. The stand pipe is sized so the entire water quality flow rate is treated, and the peak flow rate can pass through the VortFilter without restriction.