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Sliplining is the process to insert one pipe inside of another larger worn-out pipe, used most often in water and sewer or culvert applications. When this is done, the annular space (the space between the pipes) must be filled with grout to protect the new pipe. Our proprietary grout designs can be pumped at very low pressures over very long distances to achieve this without damaging HDPE pipes as well as filling pipes and tanks for abandonment.