Most likely it is just sand that you would have a garage or basement back filled with or for the base of a patio made from paves, etc. ft. area, you will need 38, 50lb bags of sand. It smooths out the imperfections in the dirt below the pool. The only pools that require sand as a base are vinyl lined ones. The sand is easily troweled flat and smooth and provides a compactable surface free of any rocks or debris with sharp edges that could puncture the liner. When installing your above ground pool, you need to make sure that you use the correct type of swimming pool sand for the bottom of the pool and a different type of sand for your sand pool filter. A friend who had them digging under his liner said that when he replaced the liner he did “soil cement” treatment under the pool and has had no more problems. 5) Never put patio blocks beneath your pool uprights. Gravel is a permeable material, so pretty much what you are doing by using gravel around a pool is installing a french drain system around your pool also. Filling in low spots with sand or dirt is not recommended because it is impossible to compact the fill enough that it won't settle under the weight of the pool and water. I have a 15x48 each year I always have a rock or something, I use gorilla pad under my pool, so far nothing has come through the liner. I would till the sand into the soil underneath. You have terrific soil compaction because of the weight of the pool. For a pool that is 15ft x15 ft. which works out to be 225 square feet, for every inch of sand for your 225 sq. Nowadays, it … Oh, we have also put sand down every year under ours with no ill effects yet. First, compact the sand and then trowel it to have a smooth finish. 4) When the sand is placed inside the pool track it must be troweled and packed prior to putting the pool on top of it. If you place the pool track on top of sand then the sand can wash out from under your pool track and your pool will be in danger of collapse. An aboveground pool requires a level surface. We have lots of gophers. Soil cement is pretty easy if done when preparing the area for the pool, but my question is, is there any issues with having this fair hard surface under a pool? If you put top soil on without loosing up the compacted soil, you will create a hard pan that will be very difficult for plants and water to penetrate. I did last year put a patch over a rock … There is normally not anything else in it. Over time, the blog Above Ground Pool reveals, sand will shift and leak out from under a pool installed on concrete, ruining its ability to offer any kind of … Remove rocks or roots protruding from the soil. Char has a great response to your question if you have a circular pool. Gravel helps in this area to relieve water pressure that may build up behind the pool. Things to Put Under Your Pool on Grass We have never used anything other than sand from the gravel yard to do a swimming pool … A padding layer is crucial when installing a pool on concrete, but the most common form of padding — a layer of sand — is not suitable as a base layer in this situation. The pool only sits on the sand to give it a base. You shouldn’t put the sand under the track; it should be inside. The sand should be used as a buffer from the liner to the surface but not for leveling. For a round or circular pool, you will need a little less. Not troweling or compacting the sand. The sand that lies underneath your pool is called “mason sand”, while the sand for your filter is simply called “filter sand” or “silica sand… Remove all sod from the pool area and any dirt from high spots. Gravel itself compacts really well, and it is far greater than sand or dirt that may be used in place of it. Setting the pool’s track on the sand. 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