Installation of this concrete pool requires assembling forms in the shape of the desired pool with form panels which then make the shape of the pool. Similar to how forms are set up for house foundations, this process takes time. These forms are limited in the shapes of pools you can make since you can not own all the forms that exist. The over dig or disturbed soil around is also great, which then will delay the patio construction. The concrete pool builders pour the concrete into the forms. Once it hardens, the forms are removed, which then becomes the sides of the pool. The liner is then measured and fit over this shape. But again, the floor is just a thin layer of vermiculite over dirt. The concrete pool contractors in Ocean County, Mercer County, Middlesex County, Somerset County, and Union County charge almost the same price as of a gunite pool. But the concrete wall vinyl liner pools do not have the commercial qualities of a mono-lific cement shell that a gunite pool has.