The ABC of Plumbing : How a Water Softener Works

A water softener is designed to remove minerals like calcium and magnesium that cause "hard water". These minerals dissolve into the groundwater from surrounding rock. When you have hard water in the home you will find that the mineral scale shows up on glassware and in your tub and shower. When severe enough, hard water scale can harm you home's plumbing system by clogging pipes and reducing the effectiveness of your water heater. It can also make laundering clothes more difficult by reducing the effectiveness of soaps and detergents.

The Answer to Hard Water is a Water Softener

A water softener is a mechanical appliance that is attached to a home's plumbing system. Using a process called ion exchange the minerals in the water are exchanged for sodium. A mineral tank filled with tiny polystyrene beads that create a negative charge. Because the minerals in the water carry a positive charge, they will cling to the beads as the water flows through the mineral tank. Water softeners have a separate tank with a brine (liquified salt) solution. When the brine is added to the mineral tank the sodium ions, which also have a positive charge, it saturates the beads. It displaces the magnesium and calcium "softening" the water. The sodium attaches to the beads, replacing the calcium and magnesium, which get rinsed down the drain. Once rinsed of minerals, the tank is flushed of brine and refilled.

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