The Black Berkey purification element is specifically designed for the following Berkey systems: Berkey Light, Big Berkey, Crown Berkey, Imperial Berkey and the Royal Berkey. More powerful than any other gravity filter element, the Black Berkey removes or reduces foul tastes and odors, parasites, bacteria, chemicals and harmful metals without removing beneficial nutrients and minerals.
Because the Black Berkey purification process is so powerful, it can remove red food coloring from water. This allows you to test your system periodically to ensure the filtering element in your Berkey system is still removing contaminants as efficiently as possible. Berkey recommends you test your system every 3 to 6 months and purchase replacement purification components as needed.