A vinyl lining is provided between the water and the pool structure. Underneath the liner is a sand or cement-like floor, specified in dimension to the “cut” of the liner that is to be used. The floors come up to meet the walls, which are commonly 3 ft by 8 ft panels made of galvanized steel or thermoplastic. These walls are supported from behind so that they won’t bow out against the weight of the water. All of the wall panels are secured together to make up the perimeter shape of the swimming pool.
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