After hearing and reading about lizard litter for your tumbler I stopped at the pet store and bought a bag. I did mix it in with the Lyman corn cob media that I had in the tumbler. I's about half and half. The upside is it does get the brass cleaner quicker than straight corn cob media. The down side is the dust. I haven't been putting my top on the tumbler while running it so I can look in there and check the progress. Well I will tell you I put the top on now.
All in all I think I will keep using it. Don