I've been tumbling brass for at least 10 years and only remember rinsing the media once. I've changed from pins to chips, they seem to do a better and faster job . I pour off most of the filthy water then separate the chips from the brass with a RCBS media separator. Triple rinse with water then soak brass in a bucket of Wash & Wax for about 5 minutes then triple rinse with water again. Without the Wash & Wax the brass would start to tarnish soon after tumbling. Mostly do range pickup or bulk purchased once fired brass after the primers are removed.