Hi everyone, I'm new to chicken raising, and I just wanted to check if this water dispenser is safe for my chickens. We inherited an awesome chicken coop when we moved into our new house, so I decided to get some chicks. They're still in the brooder now, but I want the coop to be all ready for them when they're old enough. This water-er was in the adjoining shed, and I want to use it, but it looks a little rusty. See how there's a dirty-looking ring inside where the water goes? I scrubbed the whole thing with soap and a stiff brush (after I took this picture), but it's still there. It's not flaking off rust, but it doesn't look brand-new (obviously) so I thought I'd ask here if it could hurt them. Right now they're drinking out of a plastic bowl.