The local inspector is working on a small lot system, and in the course of discussion the idea of using a single-pass sand filter is chosen as the design alternative. The system will incorporate pressure distribution into 24 inches of a clean sand media. The effluent will move through in an unsaturated flow pattern and will be drained out of the media filter through a 12-inch layer of pea rock, drainfield rock and slotted 4-inch piping. All of this is installed in a watertight liner. Installation of this liner is the component of the system that we will explore here.Liner
