[Fred n' Ethel]

Thanks for the input, very helpful.
My local store has Black Diamond Coal Slag for single cycle, $8 per bag
Also, Black Diamond Aluminum Oxide for 6-7 cycles, $75 per bag.
Maybe the Al. Oxide would be best for the cabinet, and the coal for outside where I can just let it go after 1 cycle, no need to collect it for reuse.

Thanks again !