Chlorine Dioxide (ClO2)

What is Chlorine Dioxide?
ClO2 is a highly effective, eco-friendly microbiocide that carries US Environmental Protection Agency (EPA), US Food and Drug Administration (FDA), and United Kingdom (UK) Government approval for many of its uses. ClO2 has been recognized since the beginning of the century for its disinfecting properties; and has been approved by the US EPA for many applications including widespread use in the treatment of drinking water. It is a selective oxidant that eliminates both planktonic and sessile bacteria, disinfects surfaces, and rapidly destroys biofilms. ClO2 is a gas that is created through the merger of “pre-cursor” products. This can be done via either a two, or three pre-cursor method. For the treatment of water, ClO2 gas can either be created and forced into the water which can lead to off-gassing, or created within the water droplet. Creation within the water droplet is a much more predictable and controllable method. TERRA Services uses the method selected by the US EPA for disinfecting drinking water, and the pre-cursors listed within the “Safe Drinking Water Act.”

Chemical Properties

  • Yellow/Green in color
  • Odor similar to chlorine
  • Is highly soluble and stable in water at normal temperatures and pressures, up to 2,500 ppm
  • Remains 100% active in pH ranges from 5.0 – 9.0
  • Chemical Formula:  ClO2
  • Molecular Weight:  67.45 g/mole
  • Density:  2.4 times that of air
  • Atomic Structure:  2-Oxygen atoms, 1-Chlorine atom


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