The S-600 aerobic bacterial generator from SludgeHammer Group is certified by the International Association of Plumbing and Mechanical Officials Research and Testing Inc. and to NSF/ANSI Standard 40 as an advanced treatment system for residential wastewater. It is engineered for subsurface drip disposal. It uses microbes to process waste in the septic tank; then the organisms migrate to and remediate clogged leachfields. Complete digestion of effluent means nothing remains to create a biomat. It is an alternative to repairing or replacing failed absorption beds. 800/426-3349; www.sludgehammer.net.