Assist Rail
Required on commercial and public swimming pools, an assist rail is a handrail at the entry steps in the shallow end of the pool or spa. One style extends out over the water for residential pools, one style goes down into the water to the last step for commercial pools.

Bond
To stick or adhere to the underlying surface.

Bond Coat
Apply to the pools structure after sandblasting to provide a uniform surface for replastering.

Belly Band
Required on commercial and public pools deeper than five feet, a belly band is a row of non-slip tile, installed across the floor where the shallow end stops and the slope to the deep end begins.

Code
For commercial and public pools related to Health Dept. regulations. For new construction, this relates to city's Building Department regulations.

Deck Box
An illegal, unsafe, electrical connection under the pool deck where power connects to pool lights.

Delamination
Plaster coming off the pool's underlying structure.

Depth Markers
For commercial and public pools, depth markers are required in the waterline tile and sanded non-slip tiles on the deck.

Grab Rails
Used with wall steps in the deep end, these are a pair of metal handrails installed in the swimming pool deck and extending over the water to help swimmers exit the pool.

Gunite
A type of concrete used to build the structure of the pool.

G.F.I. (Ground Fault Interrupter)
Shuts down an electrical circuit when wet.

J-Box (Junction Box)
Above ground receptacle for power connection from power source to pool light.

Plaster
A white cement and crushed lime product that cures underwater, holds the water in the swimming pool and is a smooth maintainable surface.

Rebar Stains
Dark brown or black stains, usually circular in shape, caused by water coming in contact with steel in the concrete structure.

Trim Tile
Continuous strip of small tiles set on the top edge of steps and benches in pool plaster.

Wall Steps
Used with grab rails, these are footholds cut into the pool wall in the deep end to be used as an exit.