Choose your pool liner from our range for a customised pool look! The liner is the flexible PVC covering that keeps your pool watertight. It can be used for all pools, whatever their shape, size or level of use. Desjoyaux Pools offers 2 liner thicknesses for its in-ground pools: Liner thickness 75/100ths Liner thickness 150/100ths, traditionally known as a reinforced membrane. It is used for pools with a high level of use.