Newly re-designed replacement purifier cartridge for your Grayl GeoPress. With new channel designs this cartridge accommodates the One-Way Valve for use with electrolytes, drink mixes or other flavoured liquids. 

The cartridge will last up to 350 cycles (250 L) depending on how silty the water is that you press through it. When press time reaches 25-30 seconds it is time to replace the cartridge, although the water that does come through is just as safe.