The Silt Sifter Tube is PSI’s patented self weighted wattle offering four layers of filtration. With an outer layer of tear resistant HDPE, the Silt Sifter Tube is able to withstand the many different weather patterns and construction activities that may occur on any given jobsite. At six feet long, the Silt Sifter Tube has more flexibility than other aggregate bags and can be wrapped around the storm drain for optimal inlet protection.