However, we don't know what is best for you. So we explain the different surfaces to our customers so they can select what is just right for them.There are actually many interior pool surfaces used throughout the world. The three most common, and the three we recommend you consider, are “plaster”, "quartz" and “pebble”. Quartz and pebble surfaces were developed as solutions to the shortcomings of plaster. . . . however neither is perfect and, like most improvements, they cost slightly more than plaster.