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You would have to find out what is in your "drywall". I'm guessing this is cement type material that makes up the exterior of a lot of your buildings in Delhi? It very well may have lead or other heavy metals in it. There would be no way for us to give any kind of advice about that, b/c our building materials are different. Appropriate grit would be sharp stone particles that are between 2.5 - 7.5 cm in diameter.
I agree with u and I'm.very worried my chickens eat this I'm.worries if they have blockages in their gut