BINCHOTAN CHARCOAL: The Japanese have been using these as a water filter system for centuries. These traditional style sticks of charcoal purify drinking water, removing chlorine, softening the water and absorbing tastes and odours SIMPLE TO USE: The charcoal filter stick water filter comes ultra-sonic cleaned and ready to use. All you need to do is fill your bottle with drinking tap water and enjoy great-tasting water. Made from natural wood sticks. Dimensions vary (15 to 28mm diameter, maximum length 118mm) LONG LASTING: The natural carbon filter sticks have a total lifespan of 6 months each. As their effectiveness decreases, all you must do is boil the charcoal water filter sticks for 10 minutes to rejuvenate USE IN ANY BOTTLE: Works with any water bottle so you don't need water filter cartridges or a special filter water bottle. The charcoal filter sticks are suitable for metal and glass water bottles, carafes, jugs, and even fridge water dispensers HEALTHY HYDRATION: The activated charcoal water filter attracts the ions of contaminants to the surface of the carbon, and at the same time releases minerals such as calcium, iron and magnesium back into the water for a healthy way to stay hydrated