There are still many different opinions out there about water treatment in the wilderness. What filters to use, whether or not to use only chem tabs, how long to boil, etc. With the many voices out there in blogs, videos, and survival manuals, we though we would provide you with some solid facts from a solid source on wilderness water use protocols. Here is a link to the treatment standards and more as set by the U.S. Center For Disease Control (CDC). It contains a lot of great info, from filter use to hygiene, all of which is verifiable. We hope you enjoy, train hard, and stay safe! http://www.cdc.gov/healthywater/drinking/travel/index.html