LIFESAVER products are microbiological water filters which use ultra filtration technology to filter out viruses, bacteria, cysts and parasites from contaminated water sources. LIFESAVER bottles meet an adaption of NSF Protocol 231 based on recommendations of the U.S. Environmental protection Agency (EPA). LIFESAVER bottles filter bacteria to a minimum of Log 6 (99.9999%), Viruses to a minimum of Log 4 (99.99%) and Cysts to a minimum of Log 3 (99.9%).