We've been homebrewing for about 5 years now, and switched to kegging a year or two ago. We've made a wide variety of beers, and ciders too, but apparently we can't manage to keg water successfully. It's getting old.
I just want to have sparkling water on tap. But we've tried it a few times, and every time it tastes really, really metallic when we force carbonate it in the keg. We don't have hard water, our water tastes fine normally, and we filter just in case. None of our beers or ciders have tasted metallic in the least (I've got sensitive taste buds, I'd notice).
We've tried airing it out overnight, making sure that there's no normal air in the keg, and replacing some of the fittings.
Is it possible our water is too soft, and it's leeching metal out of the keg/fittings? I'm out of ideas, and haven't a clue how to solve this problem.