Commonly referred to as the Troublesome Trio, Iron, Manganese and Sulfur, although not a real health concern, will reap havoc on a plumbing system. As little as 0.05ppm of Manganese will cause staining of plumbing fixtures. Only 0.5 ppm of iron will cause staining. And Sulfur? P.U.! Need I say more? To battle the Trio, …