AV-100 acrylamide from Avanti International is an ultra-low-viscosity, chemically reactive gel that has a similar viscosity to water. It can permeate anywhere water can travel and has adjustable cure times from five seconds to more than 10 hours. It is used to rehabilitate and sustain sanitary collections systems by eliminating infiltration in manholes, sewer mainlines, joints, laterals, and before and after various forms of CIPP lining. It can be used to reinstate laterals, creating an effective, long-lasting water barrier while providing soil stabilization. 800/877-2570; www.avantigrout.com.