The Advanced Enviro-Septic (AES) System from Presby Environmental provides a level of wastewater treatment that exceeds the stringent standards of the U.S. and Canadian governments, according to the maker. It uses an all-natural, passive process that requires no electricity/mechanical devices and no additives, replacement media or special maintenance. It is a multistage effluent treatment system for residential, commercial and community applications. 800/473-5298; www.presbyenvironmental.com.