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The Orlando Easterly Wetlands in Orlando, FL, is one of the largest constructed wetlands for wastewater treatment, capable of treating 20 million gallons of wastewater per day. Mimicking the diversity of natural wetland systems, the project has 17 cells with three types of plant communities, namely, a marsh planted with cattail and bulrush, another marsh with more than 60 submergent and emergent herbaceous species and a hardwood swamp planted with tree seedlings and understory plants.

The artificial marshlands wastewater treatment systems in Crowley, LA, naturally and economically purifies water while providing a pleasant sight as a natural preserve. On the other hand, modifications are being instituted in Mississipi for the better functioning of their 15 municipalwetlands. Thenecessity of refinements for their optimum performance was also realized by researchers at the Tennessee Valley Authority.

The Logan Aluminum processing plant in Russellville, KY, has built wetlands, illustrating the benefits of this system in the purification and recycling of waste water. Wetlands are more proficient than other recycling processes such as reverse osmosis, evaporation and chemical treatment because of their low initial and maintenance costs, less chemical use, effluent water quality, low sludge accumulation, negligible energy consumption and lengthy life.

Bill C. Wolverton's plant/rock system benefits not only Mississippi but also other states in need of efficient home wastewater treatment. This economical system uses flowers and other common plants to purify wastewater. Plants and microbes linked with the plant root, digest bacteria and organics. Users of the system need not water the plants or use fertilizers.