There are a lot of people who swear by this handy device. Great for emergencies and when hiking in areas where you may need water. As some users have noted, it is not practical if you aren't near any source of water, which makes sense, but as long as you can get to a source this item will protect against 99.99% of bacteria (including E.coli, Salmonella), parasites (including Giardia and Cryptosporidium), and particulates such as micro-plastics, dirt, sand etc.

Note, it does not protect against water borne viruses such as hepatitis A but most illnesses from water are caused by bacteria so this will proved good protection against that. Will filter up to 4,000 Liters (1,000 Gallons) of water.