sentences:  The plant can also screen heavy metals and various other toxins from contaminated water.The roots of "Eichhornia crassipes" naturally absorb pollutants, including lead, mercury, and strontium-90, as well as some organic compounds believed to be carcinogenic, in concentrations 10,000 times that in the surrounding water.Water hyacinths can be cultivated for waste water treatment (especially dairy waste water).