8 Count 4 Sets of 2 replacement filters. Will fit the following Berke ystems: Travel Berkey, Big Berkey, Royal Berkey, Imperial Berkey, Crow erkey, Berkey Light. Black Berkey Purification Elements are more powerfu han any other gravity filter element currently available. In fact, we teste he Black Berkey purification elements with more than 10,000 times th oncentration of pathogens per liter than is required by standard tes rotocol. This concentration of pathogens is so great that the post filtere ater should be expected to contain 100,000 or more pathogens per lite 99.99% reduction - the requirement for pathogenic removal). Incredibly th urification elements removed 100%. Absolutely no pathogens were cultured fro he effluent or were able to be detected, even under an electron microscope etting a new standard in water purification. Black Berkey purificatio lements are so powerful, they can remove red food coloring from water withou emoving the beneficial minerals your body needs. Virtually no othe iltration element can duplicate this performance. The powerful Black Berke urification elements also remove or reduce viruses, pathogenic cysts arasites, harmful or unwanted chemicals such as herbicides and pesticides OCs, detergents, organic solvents, trihalomethanes, cloudiness, silt ediment, nitrates, nitrites, heavy metals, foul tastes and odors, yet the eave in the healthful and beneficial minerals that your body needs.