Pure Aqua, Inc. designs and manufactures water treatment systems in addition to activated carbon filters. These activated carbon filters were distributed to Algeria in January of 2013. They each have a capacity of 120 gpm. They were designed to work in parallel meaning that they are filtering water at the same time. Activated carbon filters are used primarily to remove unwanted taste, color, chlorine and smell from water. For more information click here: http://www.pureaqua.com/filters-housings.html