Sorry if this is a dumb question: We have 12 chickens and are building their coop and run. Would like to use an old Culligan Water Softener Plastic Tank and modify it to use as either a waterer or a feeder. Hasn't had anything in it for over 10 years. Would there be a danger in using it? People who say there are No Dumb Questions should answer a few hundred. Thanks so much for any help.