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Mn, Fe, NOM and hardness levels of the permeate line of the tested NF membranes during the filtration process at (a) TMP = 5 bar, (b) TMP = 6 bar, (c) TMP = 7 bar and (d) TMP = 8 bar (filtration of the natural GW containing 1 mg/L of Mn and Fe, 0.33 mg C/L NOM and hardness level of 250 mg CaCO/L at T = 10 C).
