Two years worth of charcoal using a traditional Japanese Binchotan method for cleaner tasting water.Binchotan charcoalIt may seem counter intuitive to purify your drinking water with a stick of charcoal, but the Japanese have been doing it for centuries. Binchotan is an active carbon made from tree branches and is renowned for its ability to soften water, add good minerals and absorb unwanted tastes and odours, such as chlorine.Fill the bottle with water and add the charcoal. Leaving it overnight is ideal, but after an hour you can actually taste the difference. If you notice that the effectiveness of the filter decreases over time, you can recharge it by boiling it for ten minutes. Boiling rinses away the impurities and allows the charcoal to absorb more.- Removes Chlorine- Adds Minerals- Natural Water Filter lasts for 6 months