A silt fence, sometimes (misleadingly) called a "filter fence," is a temporary sediment control device used on construction sites to protect water quality in nearby streams, rivers, lakes and seas from sediment in stormwater runoff. Silt fences are low cost and have a simple design, but their effectiveness in controlling sediment is often rather limited, due to problems with design, installation and/or maintenance.
Sometimes used to help support and provide more strength to silt fence
Filter bags are also called dewatering bags, sediment bags or dirt bags. Filter bags are used when accumulated water on a construction site must be pumped, to ensure the water is properly filtered of silt and sediment prior to discharge into receiving bodies. Filter Bags are constructed of strong, high quality nonwoven geotextile filter fabric with a fill port to accommodate a pump discharge hose. The filter bags permit a controlled outflow of water, while retaining harmful pollutants