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There are a couple of things you can look at to improve your blasting. First, you might want to attach a small shop Vac to the blasting box. This will pull off the dust quickly allowing you to see what you are working on. It also stops the dust from scattering to your shop. As for the Blasting medium I would recommend glass beads for steel parts, sand is sort of harsh. You can buy it from Tractor supply company or many on-line vendors. You're right that the same stuff keeps recycling, I recommend not filling the blasting box to capacity. It seems to feed better if you only have a small amount of blasting medium in the box at any time. Finally, try to provide the blasting box with more CFM than the manufacture recommends and push the pressure to the limit, they always try to say they need less than they do. You will need to keep a close eye on the blasting gun for worn out nozzles and jets, these are the worst about reducing blaster efficiency. Good Luck
 
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