Filtrexx® Engineered Soil

Filtrexx® Engineered Soil is a permanent storm water infiltration practice used to reduce site storm water runoff volume and loading of sediment and soluble pollutants; such as nutrients, heavy metals, bacteria, and petroleum hydrocarbons, from a contributing watershed or drainage area.

Filtrexx® Engineered Soil is manufactured on site by incorporating 2-4 in (50-100mm) of Filtrexx® Growing Media™ with native soil and tilling to a depth of 6-12 in (150-300mm) to create a functional soil designed for high infiltration, biofiltration, and plant sustainability.

Filtrexx® Engineered Soils improve infiltration by increasing water absorption (water holding capacity), soil porosity, and soil structure through the incorporation of Filtrexx® Growing Media™.

Storm water runoff volume reduction is closely correlated to reduction of sediment and soluble pollutant loading to receiving waters. Filtrexx® Growing Media™ chemically binds soluble water pollutants such as phosphorus, ammonium-nitrogen, heavy metals, bacteria, and petroleum hydrocarbons. Beneficial microorganisms in Growing Media™ can decompose captured pollutants to less toxic and even beneficial forms, while plant uptake can further reduce captured pollutant concentrations in the engineered soil solution.

Soil amendments used to construct Filtrexx® Engineered Soils can be applied with a pneumatic blower, spreader or similar equipment.

Applications where Filtrexx® Engineered Soils may be used include:

Around bioretention systems and rain gardens

  • Around storm water and sediment retention ponds
  • Parking lot infiltration islands
  • Vegetated (green) roof systems
  • Upslope from storm water receiving areas or conveyance systems, including: channels, ditches, swales, streams, rivers, lakes, and wetlands
  • Areas receiving runoff from impervious surfaces, hardscapes, and source pollutant landscapes, including: roads, highways, parking lots, rooftops, and land disturbing activities
  • Projects where LID, Green Infrastructure, or Green Building practices are recommended or required