A grinder might work on the shells, but they would need to be small pieces to fit down the chute.! I have a Tasin electric grinder from Northern Tools. It's strong enough to grind up chicken bones (for dog food), and we put a whole pile of semi-frozen Menhaden through it before I discovered that one dog was allergic to fish.... Fish meal would be great for the garden!
It's great to learn that the seaweed salt won't hurt the garden. No need to put it through the washer first {LOL}.
Linda
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