They stand out for the speed of installation (between 10 and 15 days) and its wide range of shapes and finishes. In addition, they are quite cheaper than the work, although not as durable and resistant as you are. Among the disadvantages, say that they also require excavation and that they can become discolored with the summer sun. They are installed after digging and leveling the ground with a bed of gravel as insulation; then, they are placed on the bed if they are made of polyester, the different parts are welded if they are made of steel, or the PVC liner or fiberglass panels are joined by the perimeter. After this, they are covered in concrete by layers or filled with surplus gravel spaces.