Don't have any knowledge of Pistachio Hulling but am well acquainted with
removing walnut hulls. We put them in potato (tow) sacks and run back and
forth over them with a pick-'em-up truck. Throwing them up against a brick
wall also works but is very tiring. Kids love to do it, especially if you
let them draw a picture of the high school principal or a strict teacher on
the wall. We used Tojo and Hitler pictures when I was a young'un.
Doc Lisenby
Zone 7/8