Once staked a footer around the base of the pool wall is to be poured, this sets the foundation of the pool. The concrete is made of thick aggregates with a 2-5 inch slump. The concrete needs to set at least for two days to achieve stability. Once this is complete the pool bottom is ready to be started. The pool bottom is first covered with a medium grade of crushed stone to give a firm base and allow for any drainage under the pool.
Next floor is ready to be constructed.
The floor is constructed of a vermiculite based mix. It is applied by hand troweled and mixed on site to specifications need to the location of the mix. It has to be troweled very smooth so that rough places do not cut trough the liner when water pressure is present. The vermiculite base provides a smoother base than concrete, and is more workable for areas inside the pool. Once the bottom has cured for 48 hours you are ready for the liner to be secured into place.