The Advanced Enviro-Septic (AES) drainfield dispersal system from Presby Environmental has been successfully tested and certified to NSF 40, Class I (a certification typically given to mechanical aeration devices), BNQ of Quebec, Class I, II, III and Cebedeau, Belgium, standards. It is composed of corrugated, perforated plastic pipe, Bio-Accelerator fabric along its bottom, which is surrounded by a layer of randomized plastic fibers, and a sewn geotextile fabric. It creates an ecosystem designed to simultaneously purify and disperse effluent after primary treatment by a septic tank. Bio-Accelerator screens additional solids from effluent, ensures even distribution and provides additional surface area. Each foot of pipe provides more than 40 square feet of total surface area for bacterial activity. 800/473-5298; www.presbyenvironmental.com.