Arsenic is going to be ...

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Arsenic is going to be removed with RO. The removal rate will depend on the specific features of the membranes, design of your plant, and so on. Usually for arsenic removal is better to work with high pH, for example dosing NaOH, but you will have to have in mind that it will increase slightly disolved solids on both feed and demineralized water and therefore must be include in the system calculation