The GST Leaching System from Geomatrix Systems uses a removable form to accurately shape and construct leaching fingers along the sides of a central distribution channel. The system is constructed with 3.4 inches of washed stone and is surrounded with ASTM C-33 sand. The fingers increase the sidewall surface area by more than six times that of a traditional stone trench. The narrow profile of the leaching fingers and central distribution channel, combined with the uniform profile of the sand treatment media, enhance oxygen transfer efficiency, resulting in better treatment of the wastewater pollutants and a leachfield with a longer life span. Its direct stone-to-soil contact enhances long-term performance. It can be configured with standard gravity, pressure and/or time-dosed distribution. 888/764-5247; www.geomatrixsystems.com.