UltraTech Sediment removal Ultra-Filter Sock. Recycled rubber media provides weight to keep unit in place while allowing maximum water flow. Ultra-Filter Socks can be used in a "treatment train" if the potential for more than one contaminant or a large quantity of a single contaminant is present. Compliance: 40 CFR 122.26. Use in front of storm drains, around downspouts, in gullies and ditches or anywhere there is potential for harmful stormwater runoff. Woven polymer casing allows water to pass through quickly while filtration media inside removes pollutants. Available in 9 foot lengths; units can be overlapped if longer coverage is necessary. Looped ends allow units to be staked in place and also assist in transport. Measures 108-inches length by 7-inches width by 4-inches height.