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Gunite (concrete) Swimming Pools

In the case of concrete pools, the material determines the shape of the pool rather than any sort of shell. The contractor will dig the hole, then create a grid pattern of steel rebar on the floor and walls. Next comes electrical and plumbing. Everything is grounded so that electricity flows to the ground and away from pool users.

After that, gunite is sprayed behind and around the rebar, gradually building up the floor and walls to the correct width. When the gunite spray has been completed, coping is installed. Coping is the rim that caps the top of the walls, making a smooth transition from the pool and deck or lawn. It can be made out of bricks, concrete blocks, or another material, so long as it slopes and water drains away from the pool.

Finally, the gunite must cure for about a week before it can support the coat of finish. This finish is usually made from plaster or a combination aggregate. You may consider adding a few rows of ceramic tile on the portion of the wall that is revealed above the water line. This both looks attractive and is easier to keep clean than plaster.

As soon as the plaster has been applied, the pool is filled. You actually do this before it dries completely, as curing is accomplished under water. You have to be careful with the filling so the flow of water doesn't mar the finish. It's best to lay the hose (with metal parts wrapped with rags) gently in the bottom.

Source: Pools & Spas

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