LifeStraw

LifeStraw is a brand of water filtration and purification devices. The original LifeStraw was designed as a portable water filter "straw". It filters a maximum of 4,000 litres of water, enough for one person for three years. It removes almost all waterborne bacteria, microplastics and parasites.^[1] A bottle was later developed which incorporated a LifeStraw cartridge into a 650-millilitre (22 US fl oz) BPA-free plastic sports water bottle.^[2] In addition to these portable filters, the manufacturer produces high-volume purifiers powered by gravity that also remove viruses. These are designed for family and community use.^[3]

The water filters are designed by the Swiss-based Vestergaard Frandsen. While originally developed for people living in developing nations and for distribution in humanitarian crisis, the filters have gained popularity as consumer products. The device is now used as a tool for survivalists and outdoor enthusiasts in addition to being used to help combat clean water scarcity worldwide. The filters can provide clean water without the need for batteries or chemical treatment. They are made using hollow fiber membrane technology. Some of them also incorporate an activated carbon component.

Contrary to popular belief, the original device does not incorporate a reverse-osmosis membrane nor is it able to filter out salts or minerals.^[4]