08-12-2007, 05:05 AM
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I doubt very seriously if there "is a problem here" but several items.
Brass is an alloy of copper and zinc and is much more corrosive than bronze as bronze is an alloy of copper and principally tin and is very "strong and tough". (hence the Bronze Age and not the Brass Age).
Again brass will corrode in the presence of a salt, obviously faster in the presence of a potassium salt instead of a sodium salt, but the corrosion should be minor. (please note that this is why when a water softener is installed in a new home plumbers employ PVC piping, PVC fittings and "plastic" tubing wherever possible in lieu of copper tubing and brass fittings [please note that a water softener does not remove calcium hardness from the water but only reduces CaCl to mostly NaCl and KCl])
If this were my "setup" I would not be worried about the induction of the elements in the brass fittings into the tank water, as their concentration will be virtually negligible, but I would operate the valve "every month or so" in order to prevent it from "sticking".