I'm never going to argue with a system that works for anyone.....we all do what works for us. For the chicken it makes no difference if the grit is found on the ground or in a dish. My reasoning is that if it's in a dish and I can see it then I know it's available and there is enough. If it's on the ground, maybe there is enough, but how do I know? Since the first indication of not getting enough can be an impaction/blockage which may or may not be treatable and recoverable, I'm more comfortable doing the best I can to prevent it. So I just make sure it's always available. Their needs can vary, someone finds a nice tasty weed that popped up and gorges on it, more grit needed, so my feeling is better safe than sorry. I also agree with what Ridgerunner posted on the 'recycling of grit" issue. That which is passed in droppings is going to be for the most part, very, very small. When you necropsy or process a chicken you will find a gizzard full of grit of varying sizes, I've never found a dropping that looks like that. The grit remains in the gizzard and grinds away until it's too small. Which is why they need a constant source to replace it when needed.