One-piece knitted polyester covers your pipe and will keep out most sedimentation and increase water flow. Dependable filter helps prevent expensive drainage system replacement or costly repairs by screening out problem-causing sand and sediment from clogging drains. Easy installation, more resistant to ripping and tearing in installation process and because it is cut to required length there is no waste. Eliminates the need for gravel backfill, delivering significant savings in installation time, material and labor.