Trusted by the US military for over a decade, MSR's USMC Individual Water Purification System (IWPS) paired with the MSR Thru-Link delivers two-stage inline filtration — hollow-fiber to remove bacteria, protozoa, and microplastics, plus activated carbon to cut chemicals, toxins, and taste. Drop it into any hydration reservoir and turn it into a field filtration system. Cana Provisions carries the full setup: the complete USMC Water Kit, the IWPS and Thru-Link filter pair, or each filter on its own. Whether you're active duty, a veteran running the same gear you trained on, or building a serious preparedness kit, this is battlefield-proven filtration built to perform. Backflush to maintain flow. Filter first, then disinfect for viruses — hollow-fiber filters don't remove them on their own.