The ThruLink filter is compact and practical. You mount it on your hydration bladder's hose (hydration bladder or hose not included), and filters 99.9999% of bacteria, 99.9% protozoa and larger particles such as microplastics. Its filtering performance matches or exceeds the U.S. EPA requirements for drinking water quality. This particular model has been in use by the U.S. armed forces for more than a decade. The filter can be used on the go, for filtering the water you suck out of your hydration bag, or at camp as a gravity filter. The filter clicks directly on Quick Connect equipped systems. Systems without Quick Connect require you to cut the hose. The filter has two elements: fiber element and active carbon element. The hose adapters fit all hydration bladder systems in our product range. Don't allow your water filter to freeze! Freezing water will break the filter. This product is the filter element plus adapters you see in the main image. Additional images also display hydr