Water hyacinth has been found to stabilize temperature in
experimental lagoons, thereby preventing stratification and
increasing mixing within the water column[117]. Water
hyacinth can convert alkaline pH into neutral[20,23]. The
reduction in pH is due to absorption of nutrients or by
simultaneous release of H+ ions with the uptake of metal
ions[20]. Borges et al.[118] obtained EC reduction by 18.1%
in 5 days and TDS removal by 39.1% in 20 days. Lissy and
Madhu[14] observed an increase in TDS when plant placed
in the tank. This increase was due to the presence of clay or
other fine particles present in the plant roots and or the
presence of high Cr concentrations. On subsequent days, it
showed that the TDS value considerably decreased by the
accumulation process