Seychelle Water Filter Straw for Water Purification Trusted Seychelle Water Filtration Technology - Great for Camping, Hunting, Hiking, Backpacking, Emergency Preperation, Survival Kits, or Just for Your Personal Use Non-toxic BPA free materials. Seychelle's exclusive filters are the most laboratory and field-tested of their kind in the world using EPA protocols and tested to NSF/ANSI Standards 42 and 53 by Broward Testing laboratory Up to 25-gallon filter life (can last much longer if the filter is used with clear water) , once you can no longer suck water through your straw, then it is time to get rid of your filter Proven effective against bacteria and virus to six logs reduction (99.9999%) Ultra light and compact