A: Your water might be affected by iron, a commonly occurring constituent of drinking water.
Iron tends to add a rusty, reddish brown (or sometimes yellow) color to water, and leaves particles of the same color. If the color is more like black, it could be a combination of iron and manganese. Both of these metals can cause staining of plumbing fixtures or laundry. Iron can easily be removed with an Aquatek Pro aerator.