Precast concrete septic tanks from Kistner Concrete Products are manufactured in sizes ranging from 600 to more than 20,000 gallons. A properly designed and installed precast concrete septic system provides watertight performance and can provide a long-term solution. They use watertight seals and high-grade butyl rubber gasket material between concrete sections and pipe-to-product connections. Structural and watertightness quality assurance/quality control testing, as well as vacuum testing per ASTM C1227, are performed to verify the products are manufactured correctly and to specification. 716-508-5594; www.kistner.com.