This type of swimming pool is made of concrete materials popular they also finish with plaster (a mixture of cement with marble of sand). This type of pool is very popular in the United States. And a difference of gunite pools is poured from the manufacturing technique. The manufacturing process by spraying gunite material on the framework of concrete poured while longer because the manufacturing process using conventional means. Material for this type of swimming pool is fiberglass which was reinforced with plastic material. Therefore this type of pool called fiberglass pools. Sometimes it was built with concrete decks surrounded by a structure. Swimming Pool.