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At 5 to 25 parts per billion, how does DHP kill anything?

Microbes require water to survive and will naturally attract water molecules from the environment. Hydrogen peroxide molecules are very similar in structure to water molecules and thus are also attracted to the same receptor sites on a microbe; however, unlike water molecules, hydrogen peroxide oxidizes the microbes’ cell membrane and disrupts their chemical structure. Liquid hydrogen peroxide must compete with water molecules for access to these points on a microbe’s cell membrane. DHP is effective at lower concentrations because it is in a gaseous state and non-aqueous.

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