Water softeners are specifically designed to reduce the hardness of water. They do an excellent job of removing minerals and metals that cause scale and create all sorts of household headaches. However, water softeners do not filter out all contaminants. This is another reason why you may need a reverse osmosis system for the water your family actually consumes. You can also look in to other types of in-home filtration systems to deal with iron and sulfur issues.
We like to remind people that “sometimes you need to get good water before you can have great water.”