LIFESAVER Systems are a British Company. On their website they say that they “…Invent, Design & Manufacture all of” their “products in Great Britain”. They serve 3 main markets: Humanitarian, Leisure & Military, making hand-pump action filtering water bottles, gerry cans, cubes, and such that remove bacteria, viruses, cysts, parasites, fungi and waterborne pathogens from dirty water to produce sterile drinking water in seconds. I came across this company on the net and have not seen their products but they look very useful and for example have been used following the earthquakes in Napal in May 2015. Have a look at the video below to get an idea of how they work.