"Economically we should have moved off then, at the beginning, as we would have been 10 years younger and that much more energetic, " said Cloete.

他说，“从经济的观点来说，我们一开始就应该离开，当时我们比现在年轻十岁，更年富力强。”

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Professor Cloete is currently working with machine manufacturers in the Czech Republic and hopes to have a mass-market version available by February 2011.

CNN: Nanotech and 'tea bag' to clean up drinking water

"All technology has its limitations, " says Cloete.

CNN: Nanotech and 'tea bag' to clean up drinking water

Although even a low-cost could be an issue for those living on a dollar a day, or less, Professor Cloete believes that a small surcharge to sales in the West could help subsidize costs in the developing world.

CNN: Nanotech and 'tea bag' to clean up drinking water