The article discusses how different plants in a constructed wetland help clean up domestic sewage. Irises are great at removing phosphorus and dirt, with removal rates of 60% and 70%. Canna and reeds in certain units also help purify the water, with removal rates of 12.2% and 11.9%. Reeds in another unit are good at removing nitrogen, with a 15% removal rate. All units help clean up organic matter. The wetland effectively cleans up the Fuyang River, meeting water quality standards for most pollutants.