1. Gravelless pipe is an option for a conventional media-filled land application system. In this system, an 8- to 10-inch corrugated polyethylene pipe is wrapped with a geotextile fabric and buried in soil. The fabric acts as a biomat interface and a wick, evenly distributing wastewater around the circumference of the pipe. It also works to prevent backfill from entering the discharge holes on the pipe. The chief advantage to this type of system is that the pipe is flexible and lightweight. It may be placed in curved trenches fitting a specific elevation on a sloping site. However, it requires proper sizing and control of effluent quality (i.e., no scum or solids) to prevent excessive build-up of biomat on the geotextile fabric wrap.