The first thing you have to look out for is that there isn't to much ground water out side the pool say when its raining or just after rain. because water may be able to build up under the pool and lift it up out of it proper position.
You can safely drain it and it can be left empty for 6-8 weeks depending on your climatic conditions
If there is an underground spring and your pool is empty, it will literally push your pool out of the ground. If you have a fiberglass pool, the pool will collapse because the dirt is just pushed up around it. The dirt will shift when the pool is empty.
Also, if plaster is exposed too long in extremely high heat, it will crack. We don't recommend draining once daytime highs are consistently over 90 degrees.
Two of the most prominent dangers of draining an inground pool are ground water causing the pool to pop out and the weight of the dirt being too much for the concrete walls causing a collapse.
there are aluminum pools, steel pools if they are above ground and they also have cement in ground pools that they build in your yard.
You might drown.
In ground swimming pools are usually bigger than above ground pools. Although rather more expensive, in ground pools will last longer than above ground pools.
Fiberglass pools are less susceptible to having problems with the finish if your water chemistry is off. They do tend to have some problems with warping that you won't have with a cement pool. The fiberglass liner is usually cheaper also.
7 Parts sand to 1 Part portland cement
That would depend on what type of pool you are installing and how you want it set up. Pool decking is most necessary for above ground pools, this would typically be of wood. For an in ground pool you would most likely use cement.
Above ground pools are cheaper to install. They offer an easy safety feature which is taking the ladder away while the pool is not in use. In ground pools offer a deeper pool that you can do laps and exercise more freely.
Louis Rodriquez has written: 'From elephants to swimming pools' -- subject(s): Cement gun, Cement guns
There are about 4 3/4 million in-ground Pools and 3 3/4 Million above-ground
In ground pools generally will last longer due to the fact that they will not experience wear-and-tear from the outside, since they are underground. In addition, free standing pools can look very unattractive when the sides become dirty.
Vinyl lined pools require less chemical treatment to use since it is not a porous material unlike cement lined ones require more chemical treatment (more porous material). Cement lined ones form more algae than vinyl.
No, they are usually in-ground. Many prefer fiberglass for it's lower cost, easier maintenance, and better algae control.