What is gunite?
Gunite is a mixture of cement, sand, and water that is sprayed on a surface under pneumatic pressure.
Gunite, along with a rebar frame, is used to create the structure of the pool. Plaster is then applied to create a water barrier. Gunite is porous and should not be used by itself to construct a pool. There must be a water barrier between the porous gunite and the water. If the plaster is not thick enough, it could allow water to seep through the gunite. This will result in water loss that is difficult to isolate without draining the pool. There are methods for repairing a pool that is not properly sealed with enough plaster.