Geocomposite Wick Drainage System. Geotextile Filtration and Erosion Control The JET Filter is a flush mount system which can be permanently installed on the front side of any earth retaining structure such as bridge abutments, sheet piling and retaining walls. With its removable designed inner cartridge, the filter can be changed and cleaned, if needed from the front side of the earth retaining structure without dredging from behind to replace the erosion control fabric.