Slugs will not cross a copper barrier. There is a type of copper tape that is sold at garden centers, that you could wrap your feeder in, and they shouldn't climb up into it.
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No, but when I first got the galvanized waterer, I used to clean it with vinegar until I noticed the galvanized finish was getting dull.Are you using vinegar in your water, I ask because it looks like corrosion on your water drinker which can be caused by vinegar.