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Calgon

[kal-gon]
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Trademark.
  1. a brand of sodium phosphate glass (sodium hexametaphosphate), soluble in water: used as a water-softening agent.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for calgon

Calgon

noun
  1. trademark a chemical compound, sodium hexametaphosphate, with water-softening properties, used in detergents
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012