For sediment or sludge dewatering applications, the tubes are filled with sediments containing sand, silt, clay or organics and or a combination of any or all of these sediments. Dewatering tubes are also used extensively in Industrial and Municipal applications where the sludge is the end product or waste from various processes. Some of the sediments like sands, silts with low organic content can be dewatered by just hooking up a hose to one of the fill ports of the dewatering bag and start pumping. This type of filling is typical of dewatering tubes used for dykes or protecting shore lines. The solid particles are trapped inside the geotextile material and the water is forced through the fabric. Other sludge’s especially those with a high organic composition or manufactured sludge’s must be pre-treated with dewatering conditioners such as polymers or coagulents to coagulate the particles together so they are too large to pass through the woven material and release the water trapped inside the sediment.