I keep my oyester shell hanging on the wall of my chickens run. Were making the run alot bigger so I'm going to move it but it's in a hanging dog food bowl that u mount to the wall. At night I bring it into the coop but it gets poop/mud and straw in it by morning and then i clean it out everytime but if I leave it outside it might rain and I replace it. Ere shpuld I out it or what should I do?