BINCHOTAN CHARCOAL: The Japanese have been doing it for centuries - using a stick of charcoal to purify drinking waterSIMPLE TO USE: the charcoal stick water filter comes ultra-sonic cleaned, vacuum packed and ready to use, all you need to do is fill your bottle with drinking tap water and enjoy great tasting waterLONG LASTING: The sticks have a total lifespan of 6 months each, as its effectiveness decreases all you must do is boil it for 10 minutes to rejuvenateUSE IN ANY BOTTLE: The charcoal water filter sticks are suitable for a bottle, carafe or jugHEALTHY 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