and Ybf (51.44 mS n1 /cm 2 ) values as registered by the SS304 samples in the S3 compared to the corresponding values in the S2 medium as given in Table 4 . In other words, the larger values of Ydl are directly related to the porous structure of the biofilm and exposed surface area of the SS304 sample to the aggressive ionic species in the inoculated medium.