Depends....
LOL
The media you use is more about the SPEED at which it cuts -- and the FINISH you want to be left with...
The amount depends on the size of your cabinet. I have a pretty good sized cabinet (TP Tools 960) and I use 25lbs in it. I store different media in 5 gal buckets... and I write the type and use on the bucket with felt pen. I'm too stupid to be able to remember....
A great place to read about media is TP TOOLS... google them. They sell lots of blast cabinets and media and accessories etc. They will discuss media and it's uses on their website.
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