The question has been frequently asked over the past few months. First and foremost, it is important to have informed and factual information on the subject. If you are asking this question, you have probably read alarming articles on the topic. We invite you to read this article from AFP to help balance the information.
The manufacturer, Berkey New Millennium Concept Ltd., confirms that graphene oxide is not used in the composition of Black Berkey filters.
Furthermore, if the water to be filtered contained this component, NMCL does not have tests to verify its reduction by the Black Berkey elements. Without test results, we cannot determine if the elements are capable of reducing or removing it.
It should be noted, however, that the filtration fineness of Black Berkey elements is about 22-24 nanometers. Any molecule larger than this measurement is mechanically trapped and thus retained by the filters.