A beautiful, natural way to purify your drinking water. This stuff is downright amazing! The process of creating Binchotan charcoal dates back to the 1600's in Japan. Made from oak branches, Binchotan charcoal is an exceptional natural water purifier. How to: Unwrap and rinse the charcoal pieces thoroughly making sure to brush off any excess ash. Fill a small pot with tap water and boil the charcoal pieces for 10 minutes to activate. Drain the pot and let the charcoal cool. Look at that, you're all set! Fill a pitcher with water, drop the charcoal in and after a few hours, the water will be purified. The charcoal works for 3 months. Just be sure to refresh it by re-boiling every few weeks to release the impurities collected in the charcoal.