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It is funny that one go's to all the trouble to supply clean drinking water, chip free feed and clean grit and when you turn around they end up eating dirt, scooping water as it runs down hill through the dirt and prefers eating sand instead of the grit. Sometimes I wander why I go...
I have zinc plates on the bottom shaft of my outboard motor to resist corrosion. I replace them every couple years as they are eaten away. (fresh water)