- Material: Binchotan active charcoal with Stainless Steel Locking Coil- Lifespan: 6 Months, Recharge After 3 Months- For Filtering & Removing Impurities in Water- One Stick Per LitreFrom the successful Charcoal Filter Range by Black+Blum, Binchotan active charcoal is used to filter water by absorbing impurities, such as chlorine. It has been used by the Japanese for over 500 years and will make your tap water taste great. This range was created to encourage people to stop buying expensive bottled water and adding to the continuing single-use plastic global environmental problem. These charcoal refills are pre-washed and vacuum sealed, so they are ready for immediate use. Upgrade any* bottle to a filter bottle. This stainless steel coil securely holds our 100% natural active charcoal filter, with no rattle and no scratches! Its taste is neutral, easy to use and allows you to turn any* existing glass, steel or plastic bottle into a filter bottle. (*minimum spout opening 30mm / 1.2in). We recommend one stick per litre, then leave for 1 hour (8 is best) and enjoy your filtered water. Each charcoal will last for 6 months as a water filter, simply recharge after the first 3 months use. They are then recyclable for other uses around the home. They fit in Eau Good, Eau Good Glass, Eau Carafe and all Box Appetit water bottles but can be used in any jug or bottle.Recharge the charcoal after 3 months of usage by boiling in water for 10 minutes and then leaving to dry in sunlight.