All GRAYL GeoPress and UltraPress bottles are now shipping with the new silicone One-Way Valve.
This allows electrolytes and sport drink mixes to be added to clean purified water without compromising the integrity of the filter, meaning anyone can power up with the purest water and electrolytes to replace essential minerals routinely lost in sweat.
What’s more, this allows a Grayl purifier to be used with a variety of flavoured drinks such as juice, sparkling water, mocktails and cocktails.
