Traditional pool plaster surfaces are composed of cement and crushed marble fines. They are smooth by nature and many colors are available through the addition of color pigments. A pebble type pool finish is an exposed aggregate, meaning there are small rocks embedded in the finish. Whereas, they provide a beautiful look they tend to be rougher on the feet than a traditional plaster. The longevity of both of these finishes rest solely on proper water chemistry and can easily last up to 20 years.