I was doing my weekly inspection of droppings and noticed that there were these little white rocks in one of the hens droppings... they werent worm eggs as they were super hard to crush.
Just means that didnt digest. Do you have granite grit accessible. Maybe try mixing the two in the same bowl thats what I do. I havent seen any residuals. I did read something that I may try though. Someone said to give Red Cell a couple of times a week (only in cool weather) says it helps with calcium absorption. I may try it one time a week and see how it goes til spring.