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permeable liner, and a shape or superstructure for supporting and reinforcing the sidewall. The frame assembly generally carries a lower rail and a premier rail to that the pool sidewall is attached. The liner is mounted on an interior surface of the pool sidewall along a top edge.

History
Swimming being an organized activity goes back so far as 2500 b.c. in ancient Egypt. Actual swimming pools were invented in the very first century b.c. by the Romans. In Rome and Greece, swimming was area of the education of young boys. Most of the Roman pools were also heated using water diverted through piping from natural springs. The elaborate bathhouses built with marble and expensive gilding were very popular with the elite society but the majority of people continued to swim in lakes and rivers. These bathing pools were the precursors to contemporary swimming pools.

In Europe, many individuals refrained from building swimming pool as a result of fear that infections could possibly be caught from infected swimmers. Europeans formed their first swimming organization in 1837 in London, which at the same time had six indoor pools. The popularity of swimming pools did not begin to boost until after the very first modern Olympic games in 1896.

Raw Materials
Raw materials for manufacturing swimming pools contain polyvinyl chloride (PVC) plastic, galvanized steel or metal, fiberglass, concrete, and polyurethane foam. Adequate steel bars for reinforcing a concrete pool range in dimensions from 0.38 in (0.97 cm) to 0.75 in (1.9 cm) diameter (these values vary depending on the structural requirements of the design). All piping used for pool plumbing is at the least schedule 40 PVC or very same and must be stamped with American Society for Testing and Materials (ASTM) approval. The liners are usually plastics or similar materials.

Design
All of the designs for swimming pools certainly are a reflection of the initial spatial and economic concerns of the consumer. Concrete pools are the most flexible with the capability to create any shape or configuration. Vinyl-lined pools are evolving into free form designs that may incorporate a larger number of design options with fiberglass pools having the most restrictive design elements (one-piece construction designed at the factory). Design drawings are completed showing the particular layout of the pool, including shape, elevation, and size. An engineer provides soil and structural analysis assisting in the location and optimal design for a swimming pool installation.

Soil analysis is conducted on all surfaces ahead of installation to make sure a structurally sound pool. A swimming also will need a system that circulates the water from the bottom of the pool to the surface to greatly help in the caliber of the water. All pools must use grounded wiring and have breakers that protect from shorts in under water lighting systems.

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