The S-600 aerobic bacterial generator from SludgeHammer Group Limited is certified to NSF/ANSI Standard 40 as an advanced treatment system for residential wastewater. It is engineered for subsurface drip disposal. Other models are listed with IAPMO to restore failed absorption beds. The unit allows introduced microbes to process waste in the septic tank; then the organisms migrate to and remediate clogged leachfields. Complete digestion reduces pumping and creates a healthy, porous biomat. It is designed as an alternative to repairing or replacing failed absorption beds. 800/426-3349; www.sludgehammer.net.