Researchers studied how to remove toxic heavy metals from industrial wastewater using plants. They used two common water plants, Pistia stratiotes and Lemna Gibba, in a constructed wetland. After 45 days, the plants reduced the heavy metal levels by 72-95%. The roots of the plants accumulated more heavy metals than the stems and leaves. The water treated with the plants was found to be less harmful to health than before treatment. This shows that these water plants can effectively clean contaminated water.