I change it out when it takes more than a couple of hours to get pristine brass. Also, I use a 50/50 mix of walnut (from the pet store!!! Much much cheaper) and corn cob media. One capful of NuFinish (7 bucks at Wallyworld) per tumbler load. One more thing.... Use a old dryer sheet, cut in half or quarters. The dust from the Walnut media holds powder and lead dust and the dryer sheets seem to hold the dust to a minimum.
Da 
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"You have never lived, until you have almost died. And for those who fight for it, life has a flavor that the protected will never know." Guy de Maupassant, 1893.
Anonymously, penned on a sign at a command post at Khe Sanh, RVN.
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