Rainfresh water softener makes water soft by removing hardness using a process called Ion Exchange. Hardness-causing calcium and magnesium ions are replaced by an equivalent amount of sodium ions. Sodium ions do not form scale, thus making the water soft, while maintaining its chemical balance. By installing the high efficiency 2-tank water softener with 60,000 grain capacity, your laundry comes out cleaner and softer, you get spotless glasses and dishes from your dishwasher, enjoy softer bouncier hair and smoother skin after showers and prevent scale build up in your bathroom and water heater. With Rainfresh water softeners you will enjoy soft water for years to come!