Hybrid constructed wetlands in Taiwan were studied to see how well they clean up pollutants in water. The researchers found that these wetlands can remove a lot of solid particles, organic matter, and some heavy metals from sewage. They also showed that the wetlands can help turn harmful nitrogen compounds into harmless ones. The plants in the wetlands help with this process by adding oxygen to the water. Overall, the study suggests that these wetlands are a good way to clean up water in tropical areas where other methods might be too expensive or not practical.