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â€¢5 filters were compared to find the most effective for an As-affected village.
â€¢Iron-based filters can remove As, but removal is affected by filter design.
â€¢Nails placed in biosand filter sand were more effective than those placed above.
â€¢The arsenic biosand filter (nails above sand) rarely removed arsenic to <50Â Î¼g/L.
â€¢The biosand filter with embedded nails removed arsenic to <50Â Î¼g/L for six months.
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