Can someone sound off on what to add to the crushed walnut shells to increase their cleaning capacity? I bought shells from the Pet Store too. By themselves, in my new tumbler, they may work in time. I didn't wait that long and added some cleaning media that I had purchased years ago. Now that added media is gone, the box it came in too, and I don't know what it was that I added to the shells. It sure cleaned cases right quick after that. Much faster than the shells by themselves.
Also, the shells I bought are real small sized - fine ground, about the size of the ground pepper they shake out on your salad at Olive Garden and Red Lobster. Are there other "gradations" of crushed shells?