Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Guardian Filter Cartridge Replacement by MSR $179.95 Availability: translation missing: en.general.icons.icon_check_circle icon Only 1 left! 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Looking for Local Pick-up? Choose a store below. Product Locator by Locally Notify me when back in stock Email address Email me when available This replacement filter cartridge restores your Guardian Purifier's flow rate, and lasts up to 10,000+ liters. Removes viruses, bacteria, protozoa, and particulates, like dirt and sediment.