Investigation: the investigation was carried out visually.The dust in question is not available for investigation, only pictures were provided.The single use paper filter and filter holders are used, but no damage can be found.The container bottoms and lids are also in used condition, several scratches on the surface, but no significant damages can be found.Conclusion and root cause: based on the information available as well as a result of our investigation, the root cause of the failure is most probably user related.Rational: the provided products are all in good condition, thus we exclude a material or manufacturing related error.Furthermore it is very unlikely that such a large amount of dust can get into a properly working container system.It is conceivable that such an amount of impurities can get into a container, if the user has forgotten to install a paper filter before the sterilization process.No capa is necessary.
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