Product Information Black+Blum Charcoal Refill Water Filter Give me the good stuff Binchotan charcoal Ingredients Binchotan charcoal derived from Japanese oak trees Brand Claims Binchotan charcoal is an active carbon made from tree branches. It absorbs impurities such as chlorine by attracting the negative ions to its surface. In exchange, the charcoal sends its nutrients (calcium, iron and magnesium) back into the …