AV-100 ultra-low-viscosity, chemically reactive gel from Avanti International is available as either granules or liquid, has similar viscosity to water, 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 municipal sanitary sewer collections systems, eliminating infiltration in manholes, sanitary and storm sewer mainlines, joints, and laterals by stabilizing external substrate. Once cured, it creates an effective, long-lasting water barrier while providing soil stabilization. 800/877-2570; www.avantigrout.com.