Does a Berkey water filter contain or filter graphene oxide?

The Black Berkey filters are made from a patented blend of various ingredients, including, for example, high-quality charred coconut shell. Berkey Water Systems confirms that there is no graphene oxide in the composition of the filter elements.

Moreover, Berkey Water Systems has no test reports available that verify the reduction of graphene oxide by the Black Berkey filters. Without test results, they cannot claim that the filter elements are capable of reducing/removing this contaminant.