Water softening is one of the most common water treatment and purification method in Hungary. This is often needed because most of our waters are groundwater, and in the water that leaks through the rocks, alot of calcium and magnesium dissolves, causing water hardness. Dissolved metal salts precipitate out of the water and limescale formation begins in the piping systems, inside household devices and equipment. As a result, their lifetime is reduced and their efficiency deteriorate. For water softening tasks, there are different types of water softener devices that remove calcium and magnesium ions that cause water hardness, and they replace sodium ions that do not cause water hardness. Smaller domestic water softeners and industrial water softeners do not differ much, usually on size.