Deep Water Culture systems, also commonly known as bubbler systems.
DWC is the practice of growing plants in aerated water. It's considered by many to be the purest form of hydroponics. DWC systems are very simple. All you need is a container, lid, pump and a net pot. The container holds the nutrient solution and the lid supports a single plant growing in a net pot. Roots grow out the net pot and into the nutrient solution held in the container below. In the container, an air stone bubbles away to agitate the solution and keep dissolved oxygen levels high-essential in any DWC system.