I emailed the company last night and they responded today and said that it's designed to fire any fine granulate, but they found that table salt is the most effective because of its sharp crystals and also because table salts usually contain anti-clumping agents.
Also, they haven't tested it in centipedes but say it's got a powerful shot so it's feasible at close range. According to their website it can kill roaches and wasps at point blank.
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I hate flies, they're such a pain in the butt.
Due to its accuracy that Family Guy skit with the huge fly taking forever to go out the window is so hilarious. Let me see if it's on YouTube...
Also, they haven't tested it in centipedes but say it's got a powerful shot so it's feasible at close range. According to their website it can kill roaches and wasps at point blank.