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凤眼莲有发达的须根和根毛，具有生长繁殖快，耐污性强等特点。它在吸收污水中的营养成分同时，也吸收水中的有害物质，使水中污染物浓度逐渐下降。有些有害物质如重金属元素，在凤眼莲根部和叶都富集后不继续降解；有些有害物质如氮、磷作为营养物质而被吸收；而酚、洗涤剂等
Eichhornia well developed root and root hair, with fast growth and reproduction, stain resistance and strong. It absorbs nutrients in sewage at the same time, it also absorbs harmful substances in water, so that the concentration of pollutants in water gradually decreased. Some harmful substances such as heavy metal elements, do not continue to degrade after the roots and leaves are enriched; some harmful substances such as nitrogen and phosphorus are absorbed as nutrients; and phenols, detergents, etc.