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Concentration of (a) Al and (b) Fe in the treated water (initial water turbidity: 130.30/NTU, pH: 6.80; initial metal concentration: Al, 8.28 mg/L; Mn, 0.09 mg/L; Fe, 2.83 mg/L; national standard of drinking water content; Al = 0.20 mg/L, Mn = 0.10 mg/L and Fe = 0.30 mg/L).
