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↑ Cheap Solutions for Global and Off-Grid Health | Can ash-and-sand filtration make off-grid water as safe as distilled? [draft]

In places without infrastructure, people need drinking water they can make safe with materials on hand. Water filtered through wood ash and sand is cheap and available almost everywhere, but its real safety is under-tested. Open question: how effectively does an ash-and-sand filter remove pathogens and contaminants compared with a distillation benchmark, and what design maximizes safety? Fund controlled lab and field testing.

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