The pre-filter is suspended under a foam float so it pulls in water from below the surface. Having a pre-filter is extremely useful if you need to get water from sources that are cloudy or have a lot of suspended solids in them like puddles, cattle troughs, beaver ponds, creeks, and snowmelt because it increases filter life and decreases filter maintenance. The pre-filter is designed to block or remove as much muck (soil, sand, and suspended solids) from the water as possible before it reaches the purifier, which is responsible for removing microorganisms. It also lets you sit in a more comfortable position while you filter water, which can be a godsend if you have to do it for a group. Having an intake hose also lets you obtain water from hard-to-reach water sources such as shallow seeps, boulder-covered springs, water flowing underneath obstructions like snow and ice, or down steep stream and river banks. The second hose expels dirty water and backflushes the purifier filter every time you pump water through the Guardian, cleaning and removing trapped impurities in order to maintain a high flow rate. The first hose is an intake hose that pulls water from the pre-filter into the purifier. The MSR Guardian comes with two hoses, a pre-filter, and a float. The Guardian has two hoses, an intake hose, and a dirty water hose that expels water that’s been used to backflush the purifier element. The pressure provided by a pumping action is required to force clean water through the walls of a filter element to remove foreign matter. Pump-style water purifiers are better than UV or chemical purifiers for processing from turbid and cloudy water sources like snowmelt, beaver ponds, and cattle troughs because they can filter out particulates in addition to pathogens. MSR Guardian Components Pump Style Water Purifiers Chemical purification in the form of chlorine dioxide or iodine tablets can also purify water, but the treatment times can take up to 4 hours and isn’t instantaneous or as taste-free as the water processed by a purifier. While Steripen UV lights can neutralize viruses, bacteria, and protozoa, they can’t remove suspended solids or dirt from water like a filter or purifier. 02 microns in size, or about is 10 times smaller than a comparable water filter like the MSR Miniworks EX water filter, which can only remove organisms down to 0.2 microns in size. The Guardian, for instance, can remove pathogens down t0. Viruses are infectious microbes that are smaller than bacteria or protozoa and the pores in regular water filters aren’t fine enough to trap them. The Guardian is a water purifier which is different from being a water filter because it can remove viruses in addition to bacteria and protozoa. Filter Lifetime: 10,000 liters, replacement filters sold separately.Wide-mouth MSR Dromedary and Dromlite Bladders.99.9% Protozoa (Giardia, Cryptosporidium, Amoeba, etc).While it is an excellent tool for backcountry use and international travel to countries with suspect water, it's also quite a nice product to have on hand for emergency preparedness at home. Self-cleaning, it has a high flow rate, and generates remarkably good tasting water. The MSR Guardian is the most sophisticated and effective water purifier available today.
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