The versatile "liquid soil" which is placed as a flowable liquid, yet hardens and rapidly develops excellent load-bearing properties with no compaction necessary. It is a back fill alternative that does not need to be compacted. Flowable fill can be especially useful for filling utility trenches and back filling retaining walls. We have seen an increased use of flowable fill in other void-filling applications such as abandoned tanks, basements, pipes, sewers, and other underground structures. Flowable fill is a combination of fine aggregates, water and a small amount of cement. The fill is quite versatile and can be either pumped or poured directly from the truck.