How LifeStraw Works

Household Water Treatment -- What Are the Options?

As filtration goes, LifeStraw is an extremely effective product (and when it's being donated to those in need, a very cost-effective one as well). But UNICEF points out some other personal filtration or water sanitation technologies that also could work in developing nations.

One is good old chlorine. In the right dose, it can kill 99.99 percent of enteric, or intestinal, pathogens (but not Cryptosporidium and Mycobacterium species) [source: UNICEF]. Another cool technology is ceramic water filters, which use an idea similar to LifeStraw. Ceramic naturally has the same small pores -- 0.2 microns -- that can filter out bacteria and protozoa [source: Brown]. They also are sometimes treated with silver to stop microbial growth (which also might make it more effective to kill microbes in general). A 2007 U.N. study of ceramic water filters declared them one of the "best available options for household water filters" [source: Brown]. Then there are solar filters, which -- much like bringing water to a boil through fuel -- heats the water enough to kill dangerous pathogens. The SODIS (solar water disinfection) method is simple as can be: Put your water in PET plastic or glass bottles, and let the sun heat them for six hours (or up to two days, depending on the weather). The process will eliminate viruses, bacteria and parasites [source: SODIS].


After discussing the merits of various point-of-consumption filters -- that is, filters that are used right before drinking -- you might be wondering if water sanitation should be done on a larger scale. Point-of-source interventions (where the water is decontaminated at the source) are also a possibility. But by and large, studies have shown that point-of-consumption is more effective, both from a public health and a cost standpoint [source: UNICEF].

As you can see, bringing clean water to the poorest parts of the globe can be a tricky business -- perhaps with the emphasis on "business." But read on for lots more information about LifeStraw and other options to make water safe for all.

Author's Note: How LifeStraw Works

I don't envy those who are in the business of trying to make the world a better place, while keeping an eye on their bottom line. No matter how much good they do, they're going to get dinged for making money off the enterprise. And indeed, there seems little doubt that Vestergaard Frandsen has a stellar product in LifeStraw. But when the CEO is putting $30 million of his own money into the project, it does give one pause. Thirty million dollars will provide for a lot of LifeStraws, sure. But that money is not a donation to bring clean water to folks; it's an investment in a company that hopes to make a profit by bringing clean water to folks.

Related Articles


  • BBC News. "New Straw To Kill Disease As You Drink." 5/4/2006. (12/20/2008).
  • Brown, Joel; Sobsey, Mark and Proum, Sonya. "Use of ceramic water filters in Cambodia." UNICEF. August 2007. (Jan. 30, 2013)
  • The Carter Center. "Guinea Worm Eradication Program." (12/22/2008)
  • Directors of Health Promotion and Education. "Guinea Worm Disease." (7/10/2009)
  • Dunn, Collin. "Sponsor a LifeStraw Family Water Filter With Project H Design." 4/25/08. (12/22/08)
  • "LifeStraw Personal Water Filter." 2012. (Jan. 30, 2013)
  • Hoffman, Jascha. "LifeStraw saves those without access to clean drinking water." The New York Times. Sept. 26, 2011. (Jan. 30, 2013)
  • Inderscience Publishers. "Cheap, Clean Drinking Water Purified Through Nanotechnology." ScienceDaily, 2/26/ 2008. (12/22/2008)­ /releases/2008/02/080220094656.htm
  • Katayama, Lisa. "Fighting water-borne disease in Africa, and making millions in the process." Fast Company. April 25, 2011. (Jan. 30, 2013)
  • Lakehaven Utility District. "Three Ways to Purify Water." (12/20/2008)
  • McCutcheon, Stacey and Denend, Lyn. "LifeStraw Carbon for Water." Global Health Innovation Insight Series, Stanford. 2012. (Jan. 30, 2013)
  • Medgadget: Internet Journal of Emerging Medical Technologies. "LifeStraw." 5/23/2005. (12/22/2008)
  • Pflanz, Mike. "World Water Day." Christian Science Monitor. March 22, 2010. (Jan. 30, 2013)
  • Rosenberg, Tina. "Clean water at no cost?" The New York Times. Nov. 15, 2010. (Jan. 30, 2013)
  • Sobsey, Mark D. "Managing water in the home." World Health Organization. 2002. (Jan. 30, 2013)
  • SODIS. "How does it work?" Swiss Federal Institute of Aquatic Science and Technology. 2013. (Jan. 30, 2013)
  • Starr, Kevin. "Thirty million dollars, a little bit of carbon, and a lot of hot air." Stanford Social Innovation Review. June 16, 2011. (Jan. 30, 2013)
  • Time. "Best Inventions 2005: Healthy Options. Clear Water Revival." 11/13/2005. (12/22/2008),8599,1129522-2,00.html
  • UNICEF. "Promotion of household water treatment and safe storage in UNICEF wash programs." UNICEF. Jan. 2008. (Jan. 30, 2013)
  • United Nations Educational, Scientific and Cultural Organization. "World Water Assessment Program."(12/20/2008).
  • United Nations Water. "Water Statistics." United Nations. (Jan. 30, 2013)
  • Vestergaard Frandsen. "LifeStraw Brochure." Vestergaard Frandsen. (Jan. 30, 2013)
  • Vestergaard Frandsen. "LifeStraw." (12/16/2008)
  • Vestergaard Frandsen. "LifeStraw." Vestergaard Frandsen. (Jan. 30, 2013)
  • WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation. "Progress on sanitation and drinking-water." World Health Organization and UNICEF. 2010. (Jan. 30, 2013)
  • WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation. "Progress on sanitation and drinking-water." World Health Organization and UNICEF. 2012. (Jan. 30, 2013)
  • Wilhelm, Elisabeth, new media specialist, Vestergaard-Frandsen. Personal correspondence. January 2013.