Can you now ditch your water tanks?

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The WaterMill is designed to minimize energy use. It's so efficient that producing one liter of water costs only three to four cents.

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Whose leg are they trying to pull? This just looks like a glorified dehumidifyer with a filtration systems of some kind. On our dehumidifier at home, when humidity is high, it still costs a least 1 unit of electricity - about 12/13p ish??? these days to extract one litre of water.
 
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