This video shows you how to easily make one out of crock pots and save big. Berkey filter elements are suitable for making drinking water out of any natural fresh water source such as a pond. Removes viruses, pathogenic bacteria, cysts, parasites, harmful chemicals such as herbicides and pesticides, VOCs, detergents, solvents, trihalomethanes, cloudiness, silt, sediment, heavy metals, foul tastes and odors.