Liquid waste of chromium electroplating can cause water pollution if not treated fist.The characteristic of waste among others acidic pH, low of Dissolved oxygen (DO) and  high of Total Suspended Solid (TSS). To overcome the negative impact of chromium can be done with water weeds i.e. Salvinia molesta and Salvinia natans. The objective research was to know the  comparison effectiveness between S. molesta and S. natans as phytoremidiator and the best time exposure. Research design was Randomized Completely Block Design. The main plot was biomass of  S. molesta and  S.natans 50 g (B1), 100 g (B2) and 150 g (B3). Subplot was time of exposure i.e 1 days (T1), 6 days (T2) and 12 days (T3). There were 24  treatment combination and each treatment was repeated three times replication. Observed parameters i.e Cr in water, pH, DO and TSS. Data were analyzed by Anova and followed by Tuckeys test. This research  showed that both S. molesta and  S.natans were effective on the decrease of Cr in water and TSS on the other hand increase of pH and DO. The most effective treatment was biomass of Salvinia 150 g and 12 days of time exposure.  From this research can be concluded that both S. molesta and S.natans can be used as phytoremidiator to improve water quality but S. molesta is more effective as phytoremidiator than S.natans . Biomass of S. molesta 150 g and 12 days were the effective treatment to improve water quality of chromium electroplating.

electroplating, chromium, water weeds, DO, TSS