For use with the GRAYLA(R) Ultralight Water Purifier (sold separately), this GRAYL UltraPress Replacement Filter lasts 300 uses, or approx. 40 gallons of water. Replaceable purifier cartridge for GRAYLA(R) Ultralight Water Purifier (sold separately) Purifies and filters water in 15 seconds (2 liters per minute) Removes waterborne pathogens (viruses, bacteria, and protozoan cysts) Improves water flavor, odor and clarity Replacement Cartridge treats 40 gallons (150L) Tested to NSF/ANSI standard 42 and 53 Order today!