Capacity 27 oz. BPA-free bottle. Cork and silicon stopper. Includes 1 binchotan active charcoal filter. Replace filter every 6 months. Charcoal is washed and ready to use. Do not wash with detergent or soap. Do not use with flavored drinks or juices. Before use, remove filter and pour boiling water over it to release impurities. Small particles of charcoal in your water are harmless, and have some health benefits.