- Durable mesh fabric casing containing a filter media consisting of either recycled construction wood waste, locally produced compost or, if requested, raw wood chips. Also referred to as wattles, filter sock, biorolls or compost filter sock (CFS).
- 8" and 12" diameter are standard, 18" can be made by special order.
- Higher density and more durability than straw wattles. The higher density of Silt Sock reduces or eliminates trenching and staking and its flexibility allows it to conform to the ground. The durable, high density casing reduces waste from damage.
- Not only is Silt Sock effective as a velocity check on slopes and in ditches but it's porous filter material is also highly effective in filtering total suspended solids, petroleum residue and heavy metals as runoff flows through it.
- Quality control ensures that Silt Sock is filled to the proper dimensions to achieve its intended purpose. Silt Sock is round when it hits the ground and does not flatten over time due to media fines washing away or rapid breakdown. The filter material actually expands slightly as it absorbs runoff. If the fabric does tear open, the material inside won't blow away.
- Extensive applications including, but not limited to perimeter protection, velocity checks, dewatering basins, clean-out stations and with a modified manufacturing process, living walls. Silt Sock can often be substituted for silt fence.
- Silt Sock filled with recycled construction wood has been independently tested at the ErosionLab® near Rice Lake, Wisconsin at the Sediment Control Facility under various simulated rainfall events and was proven to be highly effective in reducing sediment loss from runoff. Independent testing also confirms significant reductions in petroleum residue, heavy metals and nutrients. Silt Sock has been approved and utilized throughout the country on projects ranging from DOT's to Oil/Gas fields.
Weed Free/Seed Free/Disease Free
- Silt Sock with industrial wood waste filter media is weed/seed free by nature due to the fact that it consists of 100% recycled construction wood. The material originates as kiln dried lumber. Once it has served its original purpose or becomes damaged, it is shredded into 2-inch minus strands. Seed bearing material is never introduced at any point in the process. Compost filler material is weed/seed free due to the composting process achieved at a State certified composting facility.
- Silt Sock is typically installed by pulling it off of a pallet with little or no staking or trenching in low flow situations (i.e. perimeter control and slope checks). Silt Sock may be used as an alternative to silt fence in many applications reducing material, labor and maintenance costs. The filler material is organic and bio-degradable; therefore removal typically consists of cutting the Sock open and dispersing the contents on site and simply removing the filter fabric casing. Due to its weight and durability, Silt Sock can often be repositioned on your site as your project advances reducing the need for additional quantities.
Environmentally Friendly (Green Product)
- Silt Sock is environmentally sound. Silt Sock is typically filled with 100% inert, weed/seed/disease free recycled kiln-dried industrial wood waste but can also be filled with locally produced compost or chipped timber debris (even from your site if desired therefore helping to fulfill requirements for Use of Recovered Materials and minimizing Waste Fees as required on Federal and other projects.).
Installation and Maintenance
- Individual project specifications should be followed when installing Silt Sock. We recommend that any filter sock be staked in higher-flow and/or concentrated-flow situations. Trenching and compacted upstream filling in ditch applications is recommended to reduce undermining potential. Perimeter protection in sheet flow and/or minimal gradient applications typically do not need to be trenched and staked. Intimate contact with the ground along entire length is essential. Sediment removal maintenance should be consistent with any type of wattle used. Pyramiding or adding an additional row of Sock upstream may also be utilized. Small holes may be repaired with zip ties; larger holes can be cut through and re-tied at the ends. In some cases, additional Sock should be installed adjacent to the upstream side.
- Silt Sock is manufactured in Rapid City, SD and while our service area is generally limited to South Dakota, North Dakota, Wyoming, Nebraska and Eastern Montana, we are part of a nationwide network of manufacturers that can get you the Silt Sock you need wherever your project may be.