The salt-free alternative to water softeners calmat® is an eco-friendly water treatment system that protects your piping system and appliances against scale deposits and rust. The calmat-Impulse-Technology is based on the principle of physical water treatment. Special electronic impulses change the crystallization process of the liquid calcium. This way the hard scale loses its adhesive power. The technology works exclusively with capacitive electric impulses: no use of any salt or chemicals.