Silt Socks: Sediment Control That Installs Without Trenching
On a jobsite, runoff carries sediment toward inlets, perimeters, and waterways — and your SWPPP requires you to stop it. Silt socks are mesh-wrapped tubes of filter media that trap sediment while letting clean water pass.
Best of all, they go down fast: no trenching, just lay and stake. Here's how to pick the right one.
A silt sock is a flexible tube of mesh packed with compost or filter media. Lay it across the path of runoff and it slows the water, drops out the sediment, and lets filtered water move through — conforming to the ground for full contact the whole way. The same product handles four different jobs.
Inlet Protection
Ring a storm drain or curb inlet to catch sediment before it enters the system.
Perimeter Control
Run along the site boundary to keep sediment from leaving the property.
Slope Interruption
Place across a slope to break up runoff length and reduce erosion downhill.
Check Dams
Set in a channel or ditch to slow flow and let sediment settle behind the sock.
How a Silt Sock Works
The sock conforms to the ground, so runoff can't sneak underneath.
As runoff reaches the sock, the filter media slows it just enough for suspended soil to settle out while water passes through the mesh. Because the tube is flexible, it presses into the ground contour and makes continuous contact — there's no gap underneath the way a stiff barrier can leave. Installation is simple: lay the sock along the contour and stake it in place. No trenching, no heavy equipment. Socks can be staked down, stacked for extra height, and in many cases lifted and reused as the site changes.
Silt Sock vs. Silt Fence
Silt fence has to be trenched in, and if water gets under it or overtops it, it undermines or blows out. A silt sock skips the trench entirely: it sits on the surface, follows the ground contour for better contact, and can be stacked to add height where flows are heavier. It's also more flexible to deploy — quick to install around an inlet or down a slope, and often reusable from one phase to the next. On the right site, that means faster setup, fewer failures, and less rework at inspection time.
Sizing: Diameter & Length
Bigger diameters handle more flow and steeper grades.
SiltSoxx come in diameters from 5" to 18" and lengths from 10' to 200', so there's a fit for everything from a single inlet to a long site perimeter. The rule for diameter is straightforward: the higher the flow volume and the steeper the grade, the larger the sock. Smaller diameters suit gentle slopes and light flow; step up to 12"–18" for concentrated flow, steep ground, and channel check dams. Socks ship by the pallet and come with installation stakes, and minimum order quantities apply.
Not sure where to start? The 8" × 200' Filtrexx SiltSoxx is our most popular option — a versatile mid-size sock that covers the majority of perimeter and inlet jobs.
Compost or Pollutant-Treatment Media?
Standard compost-filled SiltSoxx are built to trap sediment. When the discharge carries more than soil, EnviroSoxx pollutant filter socks add water-quality treatment with two media blends: the Industrial Blend targets heavy metals, hydrocarbons, nutrients, and pH balance, while the Advanced Blend targets bacteria, nutrients, hydrocarbons, and select metals. If your site has to address contaminants and not just sediment, choose a treatment blend rather than a plain compost sock.
No Trenching Required
Unlike silt fence, silt socks lay right on the surface and conform to the ground. Stake them in place, stack them where you need more height, and reposition or reuse them as the site evolves — a faster, more forgiving install that holds up at inspection.
Quick Selection Checklist
1. What's the job? Inlet protection, perimeter control, slope interruption, or check dam
2. How much flow and how steep? Higher flow and steeper grades call for a larger diameter (12"–18")
3. Sediment only, or pollutants too? Compost SiltSoxx for sediment; EnviroSoxx blends for metals, hydrocarbons, nutrients, or bacteria
4. Measure your run — socks come 10'–200' long and ship by the pallet with stakes
5. Lay on the surface and stake — no trenching; stack for added height
We carry Filtrexx SiltSoxx in diameters from 5" to 18" plus EnviroSoxx pollutant filter socks — all made in the USA, third-party tested, and compliant with most state and federal agencies including the US Army Corps of Engineers, USDA, and NRCS. Every order ships free.
Not sure which sock fits your site? Use the Silt Sock Finder above — answer a few quick questions about your application, flow, and grade, and we'll point you to the right product.
