The GST Leaching System from Geomatrix Systems is an adaptation of the stone leaching trench. This traditional leaching system has been improved with the use of 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-inch 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 efficiencies, which can result in better wastewater treatment and a longer leachfield life span, according to the maker. It has direct stone-to-soil contact for enhanced long-term performance and can be configured with standard gravity, pressure and/or time-dosed distribution. 888-764-5247; www.geomatrixsystems.com.