The investigation of an electrolytic process to remove Pb(II) from simulated wastewaters using a stainless-steel wool (SSW) cathode in a flow-through cell under potentiostatic condition is reported. Voltammetry under hydrodynamic conditions was used to estimate the diffusion coefficient, which was found to be 1.4 Â 10 )5 cm 2 s )1 in the supporting electrolyte (0.10 mol l )1 NaNO 3 and 0.10 mol l )1 H 3 BO 3 , pH 4.8). The performance of the flow-through cell was evaluated for three potentials: )0.70, )0.80 and )0.90 V vs. saturated calomel electrode (SCE). At )0.70 V, the reaction was found not to be completely controlled by mass transfer, while at )0.80 V and )0.90 V the Pb(II) concentration decayed exponentially. At )0.90 V, using a flow rate of 250 l h )1 , after a 90-min electrolysis, the Pb(II) concentration decayed from 50 ppm to only 1 ppm, corresponding to a 98% removal.