Excessive manganese in water causes staining of household fixtures, can cause water to appear a brownish or blackish color, and can impart objectionable metallic taste. This metal may be naturally occurring or produced as by-products of corrosion.
Manganese in water can also cause corrosion. Corrosion, which can occur when water that is too acidic (low pH) or too alkaline (high pH), is an oxidation/reduction process that can cause severe damage to metals.
There are two simple methods of reducing metals like manganese in your water. The first is to flush your pipes by running the water for 30-60 seconds before using it. A second method is to install a point-of-use water filtration system that is NSF International certified for reduction of one or more metals.