I was using some granite grit that was ground up pretty small and then I ran out and bought another bag not realising that the new bag had different size grit in it. The new bag has really big pieces of gravel (to my eyes anyway) and I am finding quite a bit of it on the floor. I am thinking it is maybe more turkey size? What do you think and what size grit do you feed your chickens? They have also got pigeon grit at the feed store - it has calcium and vitamins etc added. Is this ok to feed to chickens? Thank you for your feedback folks - this place is such a great resource!