Fill sand is a natural blend of dirt, clay and sand that is not processed.This is a material used primarily for fill. There is no organic matter added to it and it compacts very well. Fill sand can be worked by hand, but it is quite difficult to use. As it is generally used as a fill, it will need to be top-dressed with a soil before a garden or lawn is planted. Fill sand can be used for back-filling holes or trenches, filling holes where good compaction is required (e.g. where something will be built over the filled area) or filling in areas by hand that other soils are too expensive for.