Effectively, water that passes through Black Berkey® filters tends to be more basic than it was before. Its pH goes up. And that's actually a good thing... This is because pathogenic bacteria and viruses tend to thrive in acidic environments and have difficulty surviving in alkaline environments. And the higher the pH, the more alkalinity there is.

Nevertheless, it should be kept in mind that the final pH level of the treated water may depend on other factors, such as the pH level of the water before filtration.