I have been using a small plastic waterer but the weather is getting colder fast. I would like to use a galvanized waterer on a heated base instead for the winter. Plus the galvanized waterer is much bigger. The galvanized one I have is older and is rusted around inside of the part where the chickens drink. I scrubbed it out and tested the it, and the rubbe seal is fine and the waterer is functional. Do you think the rust is harmful to the chickens though? It is not loose, but there is quite a bit of it. I am trying to save money by using what I have, but naturaly I don't want to harm the chooks.