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Aluminum oxide is the sensible surface of the substrate at twofold the speed as sand without all the thriving danger. Aluminum oxide is available in two sorts one is virgin grit and the second is business grit. Virgin grit can be reuse more than 6-7 times with no issue. Additionally, business grit is used 2-3 times. Aluminum oxide conveys less buildup while use. Virgin aluminum oxide is more expensive than business grit.