The Red media is Tufnut and is classed as polishing media compared to the Green corncob which is more a cleaning media , although I have only used the green stuff I have found there to be different types of that , as one really makes the cases sparkle and another isn't so effective . Adding rag or tissue will collect some of the dusty crap out of the bowl while you are tumbling . My cases are already cleaned beforehand with an Ultrasonic cleaner and I just use my tumblers for a bit more bling , so my media doesn't really get dirty as such .
mike