Last night I bought a small rubber trough. I'm guessing your use them with horses because there was a picture of one on the front. Well it smells like rubber, yes I know it sounds stupid but like a very strong smell and I don't know if it's safe to put chicken feed in nor water because I feel like it'll release toxins into it. Someone said not to wash it with soap or water because the soap will get into its pores but all I did was rinse it.