Whole House Filtration vs Water Softener Many homeowners in Orange County use the terms water softener and whole house filtration interchangeably — but they solve completely different problems. Understanding the difference helps you choose the right system for your home, plumbing, and long-term equipment protection. Let’s break it down clearly. What Is a Water Softener? A water softener removes hardness minerals — primarily: Calcium Magnesium These minerals cause: Scale bui