oxidation with chlorine, ...

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oxidation with chlorine, addition of ferric chloride or ferric sulphate, some level of mixing and a good filter is all you need. Iron dosed at between 10:1 to 20:1 to the amount of arsenic you want to remove will be required. Removal of 0.25 mg/l of As will require somewhere between 2.5 & 5.0 mg/l of iron dosage. Chlorine is required for correct As speciation. Don't fall for "gimmicks".