Personally, 6 inches below the soil here, it is all sand. Two buckets full with the tractor, and I have enough for the season. I have to let it dry, then sift it through an appropriate screen. I reuse it a couple times until it is getting too fine, then use fresh from the pile.
If you are buying sand (or whatever medium you decide to use), it does tend to make the whole operation cost just as much or more than taking it to the local blaster. I could not imagine trying something like this in a residential area.
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