Frequent Asked Question: Which Level of Ozone is Required in a Hot- or Cold-Stored WFI System?

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Ozone can be used for the sanitisation of water systems. Which level of concentration is required in water – i.e. in WFI – depends on different factors. Read more about the sanitisation of water systems with ozone.

http://www.gmp-compliance.org/enews_05131_Frequent-Asked-Question-Which-Level-of-Ozone-is-Required-in-a-Hot–or-Cold-Stored-WFI-System_15160,15154,15090,Z-PEM_n.html

The usage of ozone is only senseful in cold water systems. But the decisive question is whether ozone is used for a short-term (1-2 hours) or for a long term (> 6 hours) prevention of microbial growth. In the first case, > 50 ppb ozone is generally sufficient whereas in the second case at least 20 ppb are required.

One should keep in mind that WFI cold systems have basically a higher risk of microbial contamination. The need for ozone in large ring systems or in areas difficult to access may be higher. The ozone levels mentioned should thus be achieved in the return flow. Setting the correct ozone concentration for the…

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