Calgon

[ kal-gon ]
/ ˈkæl gɒn /

Trademark.

a brand of sodium phosphate glass (sodium hexametaphosphate), soluble in water: used as a water-softening agent.

British Dictionary definitions for calgon

Calgon
/ (ˈkælɡɒn) /

noun

trademark a chemical compound, sodium hexametaphosphate, with water-softening properties, used in detergents