Pure Aqua, Inc. designs and manufactures water treatment systems in addition to industrial steel multimedia filters. These multimedia filters were distributed to Kuwait after completion in July 2013 to treat ground water. These industrial multimedia filters have a sole purpose of removing sediment from the water which will reduce turbidity. There are four units total in this shipment, however, they each work independently. For more information click here: http://www.pureaqua.com/media-water-filters.html