A Water Softener is a whole-house filtration system that removes hardness-causing calcium and magnesium minerals from your water through a process called ion exchange. It is a filtration system that works to remove high concentrations of calcium and magnesium that cause hard water. The softener addresses one of the most prevalent and devastating water problems: hard water. Hard water wreaks havoc on the modern home. The Water Softener is made for industrial and commercial uses.