The Set Bincho Bottle 1 L from Sort Of Coal is a premium glass water bottle featuring a handcrafted piece of Kishu Binchotan, the renowned Japanese white charcoal. When immersed in water, the Binchotan acts as a natural filter, purifying and enriching the water with essential minerals like potassium and magnesium. For optimal use, sterilize the Kishu Binchotan by boiling it for five minutes and let it dry. To purify water, fill the bottle with cold tap water, gently slide the Binchotan inside, and let it steep for at least two hours (preferably overnight). Refrigerate the purified water for at least two hours before serving. When not in use, store the Binchotan dry in a container. The bottle is dishwasher safe, making it a practical and sustainable choice for your hydration needs.