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Residual concentration of Al, Mn, and Fe in treated water using 10 mg/L coagulant dosage of ACH and chitosan (initial water turbidity: 826.30 NTU, pH: 5.21; initial metal concentration: Al, 75.14 mg/L; Mn, 0.10 mg/L; Fe, 7.70 mg/L; national standard of drinking water content; Al = 0.20 mg/L, Mn = 0.10 mg/L, and Fe = 0.30 mg/L).
