Most of the pools in the area are built with block and then plastered on the outside and inside. This system works for some years but then especially after a couple earthquakes the first cracks start to appear. The pool will loose constantly water and problems like that are very hard to detect and to fix.
We built our swimming pools as poured solid structures which cannot crack even under the most severe earthquakes. If combined with helical piers the pool is basically indestructible and will not settle on poor soils. We also use professional formwork which shortens the construction time and results in straighter walls with less imperfections.
The same building process can also be used to built high quality water tanks.