⏤ Dependably Simple ⏤ The unwanted minuscule organisms simply cannot physically pass through the unique material used in Black Berkey Filters. The particular technology of the pore structure within the filter purifies the water. The micro-filtration separates out the smallest of water contaminants (even viruses!) In addition to toxins not being able to get through the Berkey Filter, it also repels contaminants. Ionic absorption keeps water pure by adding an ionic charge to keep things like heavy metals and chemicals out. These two features are built into the structure of the filter. They do not wear out or diminish in ability over time. Using straightforward mechanics to bring simple, pure water to you. Get peace of mind today. Buy Berkey.