Stormwater, Ponds/Lakes & Aquatic Management Services
Natural Resource and Community Open Space Management
Professional Environmental Services and Due Diligence Reporting
Erosion and Sediment Control
Project Management
Water Quality Management
Aerators / Diffusers

Erosion Control and Sediment Control

Using Best Management Practices, Envirotech provides design specifications and installation of erosion control structures for stabilizing coastlines, stormwater management facilities, ponds and lakes, roadways, streams and rivers, and disturbed soils.
Using organics-based solutions, Filtrexx® is an innovator in erosion and sediment control, stormwater management and vegetation establishment, and restoration/remediation. Through the use of patented FilterSoxx™, third party testing, and certified installers like Envirotech, Filtrexx® both prevents and restores the negative environmental impact of construction activities.
Filtrexx® is a proven green technology that can be used in over 100 applications. Filtrexx® uses locally made, annually renewable, biobased, recycled compost and other organic materials, contained by USA manufactured mesh containment systems to create patented products used around the world.
Filtrexx® Mesh for Compost FilterSoxx™--  Filtrexx® Soxx™ is a patented unique tubular mesh containment system used to contain organic media for a variety of applications, available in various diameters and strengths. This mesh tubular product is filled on site with a compost filter media or growing media. It can be a continuous length, or can be cut to fit the application, and can be palletized.
The Filtrexx® Advantage
Filtrexx® brand compost filter socks are the only filter socks in the marketplace to meet all regulatory specifications. They are also constructed to withstand the elements and not rupture or tear, thus reducing maintenance costs.
Using Filtrexx® products is your assurance that the product:
--Avoids the risk of regulatory non compliance
--Eliminates costly re-install and non compliance costs
--Saves money for you over the life of the project
Sediment Control
Filtrexx® Sediment Control is a three-dimensional tubular sediment control and storm water filtration device typically used as a silt fence replacement (perimeter control device) for sediment and soluble pollutants (such as phosphorus and petroleum hydrocarbons), on and around construction activities. Filtrexx® Sediment Control traps sediment and soluble pollutants by filtering runoff water as it passes through the organic structure, and by allowing water to temporarily pond behind the device, allowing deposition of suspended solids. Sediment control is also used to reduce runoff flow velocities on sloped surfaces.
Benefits include:
  • 50% more design capacity and flow through than silt fence
  • NO trenching, NO soil disturbance
  • Easy removal and little disposal costs
  • 8x less maintenance than silt fence (USEPA)
  • Exceeds federal standards
  • Reduced ecological footprint: recycled, biobased, locally manufactured, indigenous materials, carbon neutral.
  • Can be Installed by trained, certified professionals
Stormwater Management
The Filtrexx® Compost Stormwater Blanket (CSWB™) is used as a practice for storm water runoff reduction and permanent vegetation establishment;  used on post-construction soil surfaces and in Low Impact Development (LID) projects. Stormwater blankets are intended for application and use where:
  • Reduction of pollutant loading in storm runoff is required
  • Land disturbing activities have ceased
  • Permanent vegetation is required
  • Runoff volume reduction from landscape or drainage area is necessary
  • Reduction in the size of storm water collection, bioretention ponds, and rain gardens is necessary
  • Where Low Impact Development ordinances and guidelines must be met
Stormwater blankets are a natural sponge for rain water and non-concentrated storm runoff. By holding large volumes of rainwater at the soil surface, Stormwater blankets increase infiltration, evapotranspiration, and plant available water that would normally wind up as runoff. These processes restore the natural site hydrology through ground water recharge and atmospheric water vapor.
Erosion Control
The Filtrexx® Slope Protection and Compost Erosion Control Blanket (CECB™) is a practice used in slope stabilization, erosion control, and vegetation establishment.  It is used on slopes to stabilize bare, disturbed, or erodable soils on and around construction activities. Slope protection is used for temporary and permanent slope erosion control and vegetation establishment applications. Slope protection is surface applied to a depth of 1.5 to 2 inches or 200-270 cubic yards/ac, and is typically applied to slopes with pneumatic blower trucks or similar equipment. Filtrexx® LockDown™ Netting can be used to increase the stabilization and erosion control capabilities of slope protection. LockDown™ Netting is a single net erosion control blanket stapled to the slope prior to application of the slope protection. Together, these products form an interlocking system of structure and natural organic material for maximum slope stabilization and vegetative sustainability. 
Benefits include:
  • 100% soil contact
  • Seed mixed throughout blanket profile
  • Increases stormwater infiltration
  • Reduces runoff
  • Adds organic matter, buffers pH, provides slow release nutrients, and restores soil biology which aids in better growth
  • Reduced ecological footprint: recycled, biobased, locally manufactured, indigenous materials, carbon neutral.
  • Can be used on 1:1 slopes with LockDown™ Netting
Streambank Stabilization
The Filtrexx® Bank stabilization is a vegetated soft armoring system designed to stabilize banks and prevent erosion of riparian areas, waterways, and shoreline banks. The Bank Stabilization system uses heavy duty tubular mesh nettings and/or geogrid to provide structural protection, control erosion, and establish and reinforce vegetation all in one simple system.
Filtrexx® Bank Stabilization has been specifically developed to withstand high flow velocities and shear stresses that conventional products cannot withstand. This patented system allows vegetation to grow from the inside out to create a natural anchor within the tubular mesh Soxx™, and between the bank and the stabilization system. Our drip tape irrigation system (optional) ensures rapid establishment and sustainability of seed and live stake plantings. Filtrexx® Bank Stabilization system is recommended for:
  • Structural stability and protection from toe-cutting and sloughing of the waterway banks
  • Structural stability and protection from mass wasting and sloughing of the shoreline from wave action
  • Control of erosion from overland runoff, wave action, and shear stress from concentrated flows
  • Control of runoff velocity flowing to receiving water
  • Dissipation of runoff energy flowing to receiving water
  • Sustained vegetation health
  • Sediment, soluble pollutant, and pathogen removal efficiency of runoff flowing to receiving water
  • Restoration of riparian ecosystem and wildlife habitat corridors
Slope Restoration
Filtrexx® Slope Interruption is a three-dimensional tubular runoff and erosion control device used for runoff velocity and erosion control on hill slopes prior to final stabilization during construction activities. Filtrexx® Slope Interruption slows runoff velocity and reduces soil erosion by dissipating the energy of overland sheet flow runoff, reducing its erosive potential, while also trapping moving sediment and soluble pollutants. Advantages to Filtrexx® Slope Interruption include:
  • Slow runoff velocity
  • Reduced slope soil erosion
  • Reduced effective slope length
  • Reduced ecological footprint: recycled, biobased, locally manufactured, indigenous materials, carbon neutral
Vegetation Establishment
The Filtrexx® Vegetated Filter Strip is a temporary or permanent vegetative filtration practice used to reduce site storm water runoff sediment and soluble pollutants, such as nutrients, heavy metals, bacteria, and petroleum hydrocarbons, from leaving a site and entering conveyance systems or receiving waters. Filtrexx® Vegetated Filter Strips are generally used for post-construction applications where permanent vegetation is designed to increase storm water infiltration and pollutant filtration. Filtrexx® Vegetated Filter Strips are of a specified width and utilize a 1 to 2 in (25-50mm) layer of Filtrexx® Growing Media™ blended with a specified seed mix and are applied with a pneumatic blower or similar equipment. Areas where Filtrexx® Vegetated Filter Strips are used include:
  • Highway, street, and parking lot runoff
  • Surface water, riparian area, and wetland buffers
  • Above stream bank or shoreline structural stabilization projects
  • Around channels, ditches, and swales
  • Around bioretention systems, rain gardens, storm water and sediment detention ponds
  • Around site perimeters where land disturbing/construction activities may occur
  • Prior to structural sediment control barriers
  • LID, Green Infrastructure, or Green Building practices are recommended or required
Soil Remediation
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
Channel Protection
Filtrexx® Channel Protection is a flexible soft armoring system designed to stabilize and prevent erosion of channel beds and banks used for storm water conveyance and concentrated storm water flow. The Channel Protection technology provides structural protection, erosion control, vegetation establishment, and vegetation reinforcement in the same system. The weight and anchoring system can withstand high storm runoff velocities and hydraulic shear stresses surpassing most traditional soft armoring devices (turf reinforcement mats, rip rap, cellular confinement systems) as tested by the Texas Transportation Institute.
Benefits include:
  • Structural stability of channel and swales
  • Prevention of bed and bank erosion
  • Scour protection
  • Control of stormwater velocity
  • Dissipation of runoff energy
  • Sediment and soluble pollutant reduction in stormwater
Rain Garden
The Filtrexx® Rain Garden is a Low Impact Development (LID) management practice that combines native soil, compost, plants, and beneficial microorganisms to filter, retain, and infiltrate storm water runoff from developed sites. Filtrexx® Rain Gardens are designed to decentralize and distribute site storm water to reduce off-site storm water volume, peak flow rate, and pollutant discharges. Filtrexx® GrowingMedia™ is an important component of a successful Filtrexx® Rain Garden installation, while Filtrexx® Treatment Train technology can be used to target specific storm water pollutants, such as harmful bacteria, nutrients, heavy metals, and petroleum hydrocarbons.

Filtrexx® Rain Gardens can be installed on virtually any site utilizing a variety of design goals. Filtrexx® Rain Gardens are recommended where:

  • Post-development hydrology must mimic the pre-developed or natural site condition
  • LID, Green Infrastructure, or Green Building practices are preferred or required
  • Reduction of site runoff volume, peak flow rate, and/or pollutant load discharges is desired or required
  • On-site treatment of storm water in desired or required
  • Aesthetic, land-based storm water treatment is desired
  • Stormwater treatment must use natural design elements, protect or restore  wildlife habitat, or restore ecosystem services
  • Land improvement, function, and real estate value are important
  • Reduced ecological footprint is desired, including use of materials that are: recycled, biobased, locally manufactured, indigenous, and carbon neutral
Inlet Protection
Filtrexx® Inlet Protection is a three-dimensional tubular sediment control and storm water filtration device designed for storm drain and curb inlet protection. Sediment and soluble pollutants (such as phosphorus and petroleum hydrocarbons) are filtered from runoff water as they pass through the organic structure, and by allowing water to temporarily pond behind the inlet protection, allowing deposition of suspended solids.
Benefits include:
  • Emergency overflow prevents flooding
  • Easy to maintain, replace, and repair
  • Do not need to remove storm grate to install
  • Flocculants available
  • Available on pallets
  • Heavy duty Soxx™ available for high traffic areas
  • Reduced ecological footprint: recycled, biobased, locally manufactured, indigenous materials, carbon neutral
Nutrient Reduction (TMDLs, NPDES)
Filtrexx® EnviroSoxx® consists of sediment control devices with one or more natural additives used to remove invisible pollutants, including nutrients such as nitrogen and phosphorus.

Filtrexx® Nutrient Removal is a natural flocculent that is used with Filtrexx® stormwater pollution prevention practices, such as sediment control, check dams, inlet protection, biofiltration and bioretention systems. It is specifically used to reduce nitrogen and phosphorus loads in stormwater runoff, particularly on or around sensitive watersheds and receiving waters, TMDL (303d) listed water bodies, land application of fertilizer, land application of animal manure and litter, pet parks, animal feeding operations, golf courses, lawns, industrial areas, parking lots and parking decks, highways, car washes, marinas, and boat docks.

Filtrexx® Nutrient Removal is a natural material that chemically absorbs soluble phosphorus and nitrogen in water and stormwater, thereby reducing transport to water bodies, reducing bioavailability to aquatic plants, and minimizing algae blooms, eutrophication, and low dissolved oxygen levels that can lead to fish kill and collapse of aquatic ecosystems.

Coir Logs
Coconut Fiber for Erosion Control
Because natural coconut fiber is 100% biodegradable with a non-invasive design, it provides an easy, natural solution for projects requiring restoration, stabilization, or vegetative growth. These products have been successfully used to help manage Beach Erosion, Coastal Erosion, Soil Erosion, Water Erosion, Wind Erosion, River Bank Erosion, Weathering and Erosion.
Coconut fiber coir logs are a reliable erosion control product designed to aid in the stabilization and re-vegetation of hillsides, banks, shorelines and other areas prone to erosion. Logs are constructed with compact interior cores that have been densely packed with coconut fibers, then covered with an exterior coir mesh netting that helps to keep fibers in place. They are often used on steep slopes or areas with exposure to waves or currents which cause instability on a site.
How Coir Logs Can Help:
Coconut fiber logs are designed to help withstand wave impact and stormwater sheetflow forces without deformation or loss of materials. This helps to ensure maximum erosion prevention, enhance plant growth, and increase microbial activity. They are also a great way to collect and hold mineral and organic particles, providing a stable substrate, and promoting root growth. More importantly, the logs slowly biodegrade to leave a self-maintaining erosion prevention system.
Coir Logs are Placed:
  • In flowing water areas:  They can be placed directly on the bank, often retaining fill material or securing new channel alignment.
  • In standing water:  Coir logs are placed offshore to break waves and encourage sedimentation and re-vegetation.
Natural Fibers vs. Geotextile Fabrics
Erosion control products consist of both natural fibers and synthetic fabrics. Depending on the materials used and environmental factors, some fibers will last longer than others during the soil erosion control process.
Natural fibers are typically made from materials such as coconut coir, straw and wood fibers that naturally biodegrade over a period of time. 
Geotextiles are constructed from synthetic fibers used to support the soil or other materials underneath roads, rip rap and more. Geotextiles typically feature either a woven or nonwoven construction. Woven fibers are used in separation and stabilization applications, while non-woven fabrics are ideal for areas needing increased filtration.
Natural coconut fiber products (such as coir logs, blocks, matting, straw blankets, and wattles) are typically used in areas looking to establish vegetation. They provide temporary stabilization that will biodegrade over a period of time. This time is long enough for plants to take root. They also provide natural protection while vegetation takes root. This helps to colonize and stabilize stream banks, slopes, wetlands, and hillside soils for long term erosion control. Natural fiber products are an excellent erosion control option for soil erosion prevention, restoration and reinforcement applications.
Geotextiles are used in various applications including: drainage, filtration, reinforcement, cushioning, waterproofing, stabilization and separation. They are often placed under rip rap, sea walls and other locations needing a firm and reliable foundation. Equipped to handle different areas, the woven and non-woven geotextile can vary in weight, thickness, and opening size to meet different requirements and applications.
Geotextile fabric comes in three main forms: Synthetic Non-Woven Geotextiles & Woven Geotextiles and Natural Coir Geotextiles. Each material has its own unique properties that are ideally suited for the application where it is used.
Benefits include:
  • Nonwoven geotextiles are ideal for filtration applications requiring drainage, stabilization or other water filtering requirements.
  • Woven geotextiles are best used for road construction, with rip rap, heavy erosion, embankments, and steep slopes.
  • Coir is a natural product made from coconut fiber. Coir is commonly used for sediment control and soil bio-engineering. It is 100% natural, therefore it is also biodegradable. They support growth and development of vegetation and can be made and used for short term, temporary, or semi-permanent applications.
Geotextiles Work in the Following Ways:
  • Filtration:  Provides a permanent mechanical and hydraulic filter stability as it retains fine particles when water passes from fine-grained to coarse-grained soil.
  • Drainage:  Provides water drainage and gas venting in the plane of the fabric geotextile.
  • Reinforcement:  Increases soil shear strength by providing a bonding mechanism of the geotextile-soil system to improve the soil quality and structural stability.
  • Cushion/Protection:  Allows permanent protection of synthetic sealing systems (geomembranes) against mechanical damage during installation and after completion of construction.
  • Waterproofing:  Acts as a support material for impregnations with bitumen or plastic-modified sealing materials.
  • Separation:  Permanently prevents the mixing of two materials.  
Why do we use compost and composted materials? Because Nature Can Do What Man Cannot®.
Filtrexx® International is dedicated to using only natural, biobased materials like compost in all of its technologies. Filtrexx® has developed these materials for storm water filtration, soil erosion, stormwater reduction, vegetation establishment and sustainability applications.
Filtrexx® Rip Rap Grout is a seeded organic growing media used to establish permanent vegetation within the interstitial void spaces of rip rap armoring systems. Filtrexx® Rip Rap Grout utilizes only Filtrexx GrowingMedia™. There are many benefits to vegetating rip rap systems. Advantages to using Filtrexx® Rip Rap Grout include:
  • Vegetated rip rap and similar hard armoring systems will mimic soft armoring systems
  • Increased wildlife habitat, increased landscape aesthetics, enhanced ecosystem function and restoration
  • Increased sediment and soluble pollutant removal from storm water
  • Reduced storm water runoff volume and peak flow rates
  • Increased stability and erosion control capability
  • Absorption of ground water seeps and subsurface flows

Filtrexx®, GroSoxx® and Because nature can do what man cannot® are registered trademarks of Filtrexx® International, LLC. All rights reserved. US Patents 7,226,240, 7,452,165 & Patents Pending.

FilterSoxx™, SiltSoxx™, Soxx™, LockDown™ Netting, CECB™ (Compost Erosion Control Blanket), CSWB™ (Compost Storm Water Blanket), FilterMedia™, and GrowingMedia™ are trademarks of Filtrexx® International, LLC. All rights reserved. US Patents 7,226,240, 7,452,165 & Patents Pending.

Maryland- Delaware