Fluxing ??

[Fernando]

I'm going to make up a batch of alloy and for the
initial mix I was thinking about using a bunch of loaded up
tumbling media that is going to be replaced.
Corn cob and walnut - treated and untreated that's used up.
Anyone know if this would work or any issue's?

[clodhopper]

The woody media should work as flux. All the dirt attached to the media is just more junk that will need to come out of the pot.
I would not do it, because the my goal is to clean the lead and adding dirt just does not appeal to my way of thinking, and I have no lack of clean sawdust/planer shavings.
Lot's of way to do this stuff and getting one more use out of your media truly is a noble cause.

[Duckiller]

Saw dust for your initial flux then stir with a wood stick. Dowels work great. 5/8" or 7/8" dia. Burning/charring wood will aide the flux. Be sure to stir the bottom and scrape the sides. Old media goes in the trash.