A white crystalline powder (CaCl2) used as a disinfectant for swimming pools, that is toxic if ingested, exposed to the skin and inhaled, and presents a dangerous fire risk when in contact with organic materials
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}