Hi Cameron,
Because of my low budget I have only used creek sand that has been sived through fly screen. I blast outside on a total loss system. Sand wears the nozels rapidly so I have started making my own out of 1/4" break pipe. I have a 4cfm and a 6cfm compressor both hooked up to a 60L air tank and they don't keep up but last long enough to do a side of a rim and catch up while you are turning it over and have a minute break, all up about 20 minutes to do a rim and it uses a full tank of sand per rim.
Hope this helps.
