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This is cheaper,If you de-prime and use really fine walnut media, tumbling will clean the primer pockets too.
I use/recommend this, most pet stores sell it.
Amazon.com : Zilla Reptile Terrarium Bedding Substrate Desert Blend Walnut, 10-Qt. : Pet Habitat Decor : Pet Supplies
Search results for: '25 Lbs. Walnut Shell 24 Grit Fine Abrasive Media'