Water hyacinth (Eichhorniacrassipes) has demonstrated its ability to remove nutrients and other chemical elements from sewage effluent in the process of producing larger quantities of biomass. This study attempts to compare the incorporation of cadmium in batch experiments or continuous systems. Different concentrations of cadmium (0.25; 0.50; 1.00; 2.00 p.p.m.) were used and toxic effects are obvious at 1.00 p.p.m. concentration. The distribution of the metal was followed in the medium and different parts of the plant. As expected, the roots accumulated the major part (73-86%) of the incorporated cadmium. The change of biomass of different experiments is presented in regard to cadmium concentration.