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Did you know that some bacteria can survive disinfection from well-known brands?

Bacteria are known to exist in clumps, embedded within particulates, within biofilm fragments, or can reside within oil droplets. Unless a chemical disinfectant can penetrate bacterial clumps, particulates, biofilm, or hydrocarbon, some bacteria can survive disinfection. In order for a disinfectant to penetrate these, the disinfectant must be uncharged, relatively non-polar, and an effective bactericide.

Chlorine dioxide is the only disinfectant that fits these parameters for a lasting and truly effective disinfection!

The Importance of Contact Time

Unless chlorine dioxide can penetrate the various places where bacteria are known to “hide,” then bacteria cannot be adequately inactivated. This raises the question, what limits the ability of chlorine dioxide to penetrate clumps, particulates, and biofilm? The key parameter here is contact time!

We propose that the question of utmost importance is: What concentration would be considered necessary and how much time is required for the chlorine dioxide to penetrate bacterial clumps, particulates, biofilm fragments, or oil droplets?

The Concentration and Contact Time Needed for Water Treatment

Several groups have identified this residual to be around 2 ppm, and the contact time must be 2-3 minutes, although only 2 of the reports provided data (see What Chlorine Dioxide Concentration is Required for Disinfection for sources).

In a fairly large number of field applications, data has been collected to determine this residual and contact time.  Figure 1 shows the data collected thus far showing the impact on bacterial serial dilution bottles for both APB and SRB with 2 ppm chlorine dioxide and contact time.

Chlorine Dioxide Residual Required

When evaluating solutions for your water disinfection needs, select a solution that is fast and effective. Contact us below to learn more how chlorine dioxide can meet your water disinfection needs!

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