A pack of 4 charcoal water filters to make tap water taste great! Binchotan active charcoal has been used in Japan as a water purifier since the 17th century. It may seem counter-intuitive to purify your drinking water with a stick of charcoal, but binchotan active carbon made from tree branches is renowned for its ability to soften water, add good minerals and absorb unwanted tastes and odours, such as chlorine. Use the charcoal with an Eau Good water bottle, which locks it in place so the filter won't knock around inside the bottle. Or pick up a single filter here.    What's it made of?Binchotan active charcoal filter (6 months life)   How does it come? 4 sticks of charcoal sealed in vacuum packs in a card box 16.5 x 7 x 9 cm approx