Lifestraw
LifeStraw includes LifeStraw Personal and LifeStraw Family, which are designed by the Swiss-based Vestergaard Frandsen for people living in developing nations. There are several models of the product: LifeStraw Personal filters a minimum of 700 litres of water, enough for one person and one year. LifeStraw Family filters a minimum of 18,000 litres of water, providing safe drinking water for a family for more than two years. It removes 99.9999% of waterborne bacteria, 99.99% of viruses, and 99.9% of parasites. LifeStraw Personal kills 99.9999% of waterborne bacteria and 98.5% of viruses.
The LifeStraw Personal is a plastic tube 31 centimeters long and 30 millimeters in diameter, and costs around $5.00 plus shipping. Water that is sucked through the straw first passes through a mesh of 100-micrometer spaces, then through a mesh of 15-micrometer spaces. Water then passes through a chamber with iodine-coated beads, killing remaining bacteria. The water passes through an empty chamber, then finally passes through active carbon, removing the iodide taste and medium-sized bacteria. The entire process is powered by suction, similar to using a conventional drinking straw, and filters up to 700 liters of water. The filter does not currently remove Giardia lamblia, but the company is working on this issue.
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