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Restore the flow rate of your existing MSR® GuardianTM Gravity Water Purifier (item 720190, sold separately), or purchase a back-up Cartridge for added peace of mind. Either way, the GuardianTM Gravity Purifier Replacement Cartridge gives you high volumes of purified, virus-free water on-demand. The advanced hollow fiber filter removes 99.99% of viruses, 99.9999% bacteria, 99.9% protozoa, plus sediment and micro-plastics. The two-stage purifier includes activated carbon to reduce unpleasant tastes and odors, so your water tastes delicious with every swig. Originally designed to protect service members in the field, this rugged Cartridge meets U.S. EPA and NSF P248 military testing standards.