Areobic Treatment Unit Constructed Wetland Constructed Wetland System Conventional System Evapotranspiration Bed Evapotranspiration Bed Side View Gravelless Pipe System Low Pressure Dosing System LPD Trench Detail Sand Filter Septic Tank Two-Compartment Septic Tank Spray Irrigation System Spray System STEP/STEG System Subsurface Drip System Trickling Filter Constructed Wetland Longitudinal Section of Wetland Typical Subsurface flow of Constructed Wetland Bruce J. Lesikar, PhD., Project Leader Steve Dagitz, Webmaster August 28, 1998