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Submission + - NanotechTea Bag’To Filter Water for Pennies (singularityhub.com)

kkleiner writes: Researchers at Stellenbosch University’s Water Institute have developed a new water filtration system that uses activated carbon and nanofibers to quickly filter out pathogens. The carbon and nanofibers are placed in common tea bags and then fitted into a bottle. Fill the bottle with dubious water, install a filter, and drink. It’s that easy. The ultimate price for these ‘tea bag’ nanfiber filters could be around half a cent (USD) each and be able to handle around 1 L before being replaced.
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NanotechTea Bag’To Filter Water for Pennies

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A rock store eventually closed down; they were taking too much for granite.