LifeSaver products are renowned for their portability, durability and versatility and when it comes to portable water purification, LifeSaver is 'Best In Class'. Lifesaver products are tested at independent labs using the full protocols created by NSF (National Sanitation Foundation). NSF P231 – Microbiological Water Purifiers and NSF P248 Military Operation Microbiological Water Purifiers. These are 10.5 day tests that use multiple sources of water (including imitated sewage), to stress the purifier and check it will work for you in all scenarios. All our test results are displayed on our website for the consumer to view. You can find them under each of the product listings