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No oyster shell won't take the place of grit. Oyster shell is soluble - it breaks down after exposure to moisture. Grit, the store bought type is usually made from granite, doesn't break down.
No oyster shell won't take the place of grit. Oyster shell is soluble - it breaks down after exposure to moisture. Grit, the store bought type is usually made from granite, doesn't break down.
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