The Auto-Vac from Alar Engineering Corp. separates suspended solids from septic sludge using rotary vacuum drum pre-coat filter technology. The water is drawn through a 1-micron media and typically discharges into the city sewer. The dewatered solids are captured on the drum surface and commonly disposed of at a local landfill or, in some cases, processed as compost. It is self-cleaning with every revolution of the drum, which prevents filter media from blinding or clogging. Its absolute microfiltration translates into a consistent flow of water that meets most discharge limits. The 27 inches of vacuum sucks the moisture out of the solids and reduces wet-tonnage hauling costs. 708/479-6100; www.alarcorp.com.