Wetlands, either constructed or natural, offer a low-cost technological alternative for wastewater treatment. The constructed wetland treatment system (CWTS) is a new green technology for water quality improvement and water pollution control. It is regarded as a sustainable way of water resource management.

Compared to conventional wastewater treatment plants, constructed wetlands are a cheaper alternative, using renewable enegy provides an aesthetically pleasing landscaped wetland. The constructed wetland systems have been seen as an economically attractive, energy-efficient way of providing high standards of wastewater treatment, particularly for isolated populations; yet capable of enhancing the conservation or amenity value of an area. 

Nowadays in the tropics, they are largely used to create a wetland park which provide serve multiple purposes such as serve as a refuge for wildlife whilst providing an avenue for recreational activities such as boating, cycling along trails, nature interpretation and fishing.Widespread demand for improved receiving water quality, water reclamation and reuse is currently the driving force for the implementation of CWTS all over the world. 

Constructed wetlands could be promoted to various potential users such as the tourism industry, government agencies, private residences, aquaculture industries, and agro based industries for water quality improvement and pollutant removal. Utilisation of local products and labour help in reducing operational and maintenance costs of the applied industries. Less energy and raw materials are needed, with periodic on-site labour, rather than continuous full time attention. This will contribute greatly in the reduction of use of fossil fuels as in conventional treatment plants and also reduce wastewater discharges to natural waterways and other systems. 

This technology can eventually be used to rehabilitate grossly polluted rivers in the country. It is a relatively new innovation which can be duplicated in other tropical sites.The constructed wetland treatment system also provides a research and training ground for young scientists interested in this evolving field of wetland science.