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Recently, more and more attention is paid to the possibility of purifying the aquatic environment of the aquatic environment with a variety of plants capable of acting as natural purifiers. According to the literature, one of the most promising water purifiers is a species of water hyacinth. Other authors believe that the water hyacinth is a dangerous invasive species due to its rapid growth and ability to migrate long distances. At the same time, the climatic conditions of Ukraine provide a fight against the invasion of water hyacinth due to low temperatures in winter. Literature sources indicate that eigornia is able to effectively purify water from contaminants such as oil, acetone, phenol, formaldehyde and surfactants. The purpose of this study is to study the effect of aqueous extract of Igornia most beautiful on such organopathogenic microorganisms as Escherichia coli, Staphylococcus aureus, Proteus vulgaris, Pseudomonas aeruginosa, Candida albicans, which may be representatives of the allochthonous group of bacteria. To assess eichhornia as a purifier of bacterial contaminants, a comparative study of the antibacterial activity of layered pistachio and aboriginal Ukrainian species of duckweed. Our own observations and literature data indicate the invasion of eichhornia and pistachios in the Dnieper and Kozynka rivers. All three species compared in the study are producers of green biomass, which can be used as feed for animals and birds. Recently, the literature discusses the possibility of using duckweed as a food plant. The study was performed by disco-diffusion method. The results of the study show that all the studied plants have antibacterial activity against Escherichia coli (growth inhibition zone 8-13 mm) and antistaphylococcal activity (inhibition zone 10-13 mm). To evaluate the medicinal properties of the studied plants, we compared the obtained data with the values of the diameters of the lysis zones for a number of antibiotics. Regarding Escherichia coli, the inhibition zone of 13 mm in duckweed and eichhornia is close to the similar zone of ampicillin – 16 mm and kanamycin – 17 mm, rifampin – 8-10 mm. That allows to consider all investigated plants as an effective component in sewage treatment plants. As small duckweed has fungicidal activity against Candida white, it can be recommended as a component of sewage treatment plants for milk processing enterprises.