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			 I live in CALGARY, and it would be illogical to go all the way to the coast to get oyster shell to give to chickens.  That is why I assume we use crushed granite, as we get it a lot closer.  It, however, is quite sharp.  I also thought about filter sand.  I have looked at it, and found it was just silica sand, but screened to get a uniform size.  It is also not sharp, so I think I will get some.  :D 
		
	
		
		
		
		
		
	
		
		
	
	
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