Re: thumlers tumbler how much media
red media is walnut shells with jewlers rouge. Not sure about the water in that one. I used to use the red media but switched over to green when my old stuff wore out. And i got tired of cleaning brass a second time.
IMO you would be the best to run down to your local Big 5, or gun shop and pick up a 10# (i think) pack of green and throwing the old away.
Another thing with the water, leave the lid off when you store it for a few days to let it dry. Othewise it can mold. I use mine every other day and actually never use the lid for it. (Run it in a detached 2 story shed so i dont have to listen to it).
Also man there can be problems with lead, so pour them out outside. They are really making a big point about lead now adays. There is a lot of lead in the interior of the case after being fired.