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I agree with the answer by Aseem Murtaza. For arsenic removal from drinking water, ground water etc. metal hydroxide (e.g. ferric hydoxide) based filter materials are used oftenly. Sometimes oxidation is necessary as pre-treatment, especially when a big part of the arsenic to be removed is 3-valent arsenic.

I disagree with the main article that adsorption is the only process which doesn´t need a pre-treatment. Adsorption needs always a pre-filtration, no matter if the adsorption material is activated carbon, ion exchanger resin or metal hydroxide.