Re: Garnet vs crushed glass
Garnet is harder than glass, but I'd guess the glass is still going to shred the tar and if you need more glass than you would need garnet, the glass still would be cheaper. If disposal raises hazmat problems, there are also systems that use crushed dry ice, which leaves no extra "blasting" material in the residue as it evaporates after use. That should also make the tar more brittle and easier to get off. Something to check with local suppliers.
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