Does your water look rusty or brown straight from the tap?
Do reddish brown particles settle to the bottom of your glass, your pot?
Do reddish brown stains occur in your shower, bathtub, toilets and laundry?
You probably have high levels of iron in your water. Besides leaving ugly stains on fixtures and your laundry, it can also add a metallic task to your water. And sometimes promote the growth of iron-reducing bacteria. That is troublesome.