Infilling the grid system not only adds integrity to the application, it finishes the area to match whichever style your looking for. Filling the pavers with a hard angular stone creates a locking mechanism to eliminate migration of aggregate and adds a clean finish to every project. With TRUEGRID, there is nearly zero maintenance needed, due to its unique design. It eliminates washouts and potholes which means there are few times if any to add additional aggregate to your finished project.