The MSR Guardian Filter Cartridge Replacement is a new filter for your Guardian™ Purifier. The original filter will last you for 10,000+ liters, removing the viruses, bacteria and other nasties from the water in the backcountry. At some point, you'll need a new filter so here it is. Out with the old and in with the new and you're ready for another 10,000+ liters of clean water.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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