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World water day: are filters the future?

Guardian: Since 1990 more than 2 billion people have gained access to improved water sources. It's a huge achievement that has saved thousands of lives, but the biggest challenge will be getting water to the remaining 780 million, many of whom live in the most remote and underdeveloped places on earth. Another considerable but necessary task is to provide clean water to those hit by humanitarian disasters. According to the UK government, diseases caused by dirty water and poor sanitation account for 80%...