A liner swimming pool is an alternative to concrete, but just as attractive and desirable.
Liner swimming pools are usually made up from two components., the shell, usually pre-fabricated or can be of more traditional laid block design and the finish a PVC membrane (liner) that will give the exact appearance of a concrete swimming pool.
The advantages of a liner swimming pool are firstly build time. Typically less than 3 weeks realistically.
Better heat retaining properties than a concrete swimming pool. A lot cheaper to buy and install than a concrete pool.
The added benefit that you can change the liner for only a couple of thousand pounds in comparison to knocking off old tiles and re-tiling with new, which can cost more than to buy a liner swimming pool in the first place!