What contaminants do Berkey filters struggle to remove?

Heavy Metals and Micropollutants

Berkey filters are effective at removing a wide range of contaminants, but they can struggle with certain heavy metals and micropollutants. PFAS, in particular, are known to be challenging for most water filtration systems, including Berkey. These substances are often used in non-stick coatings, firefighting foam, and other industrial applications. Berkey’s Black Berkey filters are certified to remove 99.9999999% of certain bacteria, viruses, and contaminants, but the exact performance on PFAS is not specified. In contrast, some other water filtration systems, like ZeroWater, claim to remove virtually all contaminants, including heavy metals and micropollutants.

Bacterial and Viral Contaminants

While Berkey filters are effective at removing many types of bacteria and viruses, there are some exceptions. For example, the filters may not remove certain types of bacteria like Vibrio cholerae or Campylobacter jejuni, which can cause severe gastrointestinal illness. Additionally, some viruses like norovirus or rotavirus may not be completely removed by Berkey filters. This is not unique to Berkey, however, as most water filtration systems have limitations when it comes to removing certain types of bacteria and viruses.

Dissolved Solids and Particulates

Berkey filters are designed to remove particulates and dissolved solids from water, but there may be limitations on the types and amounts of contaminants that can be removed. For example, the filters may not be effective at removing high levels of dissolved solids, like those found in seawater or highly mineralized water sources. In these cases, additional filtration steps or pre-treatment may be necessary to achieve safe drinking water.