I think grit is a waste of money If you have a run with dirt your chickens will get all the grit they need from the ground Ive had a 50lb bag since march and its 3/4 full once they went out i never gave it to them again, I do however give the chicks, chick grit, because they dont have access to gravel, I like giving them treats and watching being scared of it until they figure out its yummy