I have tumbled rusty chain in nothing other than beach sand, with excellent
results. You can, however, do better. I would suggest starting with sand (jeez,
it would seem to me that black blasting sand would just tear up aluminum) and
run it for 3-4 hours and then look at it and go from there. Keep notes and
learn as you go. - GWE

"Jerry Foster" wrote

I just got a small tumbler that I intend to use for de-burring small
aluminum parts. Does anyone have any advice on what media to use in it?
I
was thinking of trying sandblasting sand... And any idea of about how
long
to run it?