Aquatic plants like Pistia stratiotes and Eichhornia crassipes can help clean up swine wastewater. A study in Brazil looked at how temperature affects these plants' ability to treat the wastewater. They found that nitrogen removal was best in the summer, while pH and electrical conductivity were better in the winter. The plants did a good job overall, showing that using aquatic plants is a useful way to treat swine wastewater.