M.U.D. water has negligible amounts of iron so the water should not be causing the problem. We lime-soften the water to about 170 milligrams per liter, which is the same as 10 grains per gallon of hardness. This is soft enough to be suitable for all home uses.
During lime-softening, the lime (calcium) added is removed from the water along with calcium and magnesium (hardness) naturally present in the water. (In home softeners, sodium is added to the water in exchange for the hardness removed.)
M.U.D.'s water will deposit small amounts of calcium carbonate in your pipes and on fixtures. It is a tan color. This is good because this means the water does not dissolve chemicals, such as copper, from your plumbing.