Hi Rick
Hey, nice to see you join already
Check out my
wash tank thread. I started it out looking for advice on how hard it is to separate out various contaminants...but the thread is morphing into a good discussion and how-to on building such a (counter-current) wash setup.
I intend to keep adding pictures to it as they make more sense (only have my crappy camera phone, so pictures are of low quality unfortunately
)
I'll keep updating as I find parts and links.
Marbles should work, but I have no idea how one goes about aquiring 750 pounds of marbles
I lost mine long ago.