Slow Sand Filters

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Slow sand filters are perhaps the most efficient means of producing clean drinking water. Slow sand filters rely on biological processes for their action rather than physical filtration or disinfection. They require no electricity, no chemicals and no filter changes. How is this possible? The secret is that slow sand filters work through the formation […]

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Producing Drinking Water from Rain Water

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It is possible to produce pure drinking water from rain water using a combination of devices costing around $300 total. Here’s how to do it: Install a roof washer and a rain barrel ($200). A roof washes diverts the first ten gallons or so of rain water away from your barrel — it contains such […]

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