Chlorine - Cl, element 17, atomic mass 35.453, illustrating chlorination at aqueum.comIntroduction to Chlorination

Chlorination is the use of chlorine gas, sodium hypochlorite or calcium hypochlorite to disinfect water.
Similar but distinct disinfectants include chloramine and chlorine dioxide.

Chlorine can be sourced:

  1. As compressed/liquefied Cl2 gas in cylinders or drums
  2. As a liquid aqueous sodium hypochlorite solution, either produced by on site electrolysis of brine, or commercially produced offsite
  3. In solid calcium hypochlorite form.  Normally sold in tablet or powder form

Whatever the source of the chlorine it takes exactly the same form once dissolved in water:

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