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The material used is called sodium carbonate, and it gets fed into a hopper as it gets used up. Sand, plastic, copper, walnut, and other media is also used for various blasting tasks, but Cal Blast uses soda and copper exclusively. The copper process is done after the soda blast. It removes rust (unlike the soda), the invisible layer the soda leaves, and it can also leave a very, very slight etch to the metal that helps primer stick more effectively.