Pool service bead blasting is a term used for the cleaning process. Spherical particles are aimed against the pool surface at low speeds, with the use of compressed air. A bit like like sandblasting, bead blasting is a surface treatment, producing a smooth, even finish. Materials that are used for pool blasting may vary from garnet, to walnut shells, to glass. Each one of these materials are used for specific applications, producing distinct surface finishes.