Glass bead is the best media when cleaning swimming pool tile. Glass beads are environmentally friendly and will not damage your swimming pool tile during the cleaning process. The beads are manufactured from silica- and lead-free glass and are round in shape. Because of their spherical shape, the beads are able to hit the tile surface without scratching or damaging it. Glass beads provide the best pool tile cleaning results. They are more effective and safer than harsh chemicals, and will save you time and money over pumice stones.