A water softener removes minerals that create water hardness, one of the most common water quality problems a user encounters. Hard water destroys espresso machines and coffee equipment. With over 85% of the United States relying on hard water, water softeners serve a vital purpose.
In espresso machines, water softeners reduce the calcium or magnesium ion concentration in hard water. Calcium and magnesium carbonates tend to precipitate out as adherent solids on the surfaces of pipes and especially on espresso machine heat exchanger surfaces of boilers. The resulting scale buildup can restrict water flow.