Pro Therapy Supplies, located in the metro Atlanta, GA area, is an authorized dealer for Berkey Filters . Berkey water filter systems offer many different models for filtering water. Each model was designed to a specific set of guidelines in mind, and consideration of people who purchase them. Each model differs from the amount of water that they are able to produce per hour and the size of the container. Larger Berkey models also hold more filter elements, this allows the system to produce water faster because of the higher flow rate than smaller ones.