Black+Blum's charcoal water filter sticks are the ideal solution for healthy, clean hydration. They make your water taste great by reducing chlorine, mineralising the water and balancing the pH How It Works Step 1: Fill your carafe or bottle with water and place your ready to use charcoal stick inside. Step 2: Wait for the activated charcoal to remove impurities. Leaving it overnight is the best option, but you will certainly taste the difference in just one hour. Note if your charcoal is broken, due to the fact that it is an organic element it will still perform its job. How Long Does It Long? With time the effectiveness of the charcoal stick filter will decrease and affect the water taste. You can recharge the stick by boiling it for ten minutes and leave to try in the sun. Recycling Trait The water filter lasts for 6 months, once this time has passed the sticks can be recycled. The Binchotan Active Charcoal is made from 100 percent natural hardwood oak. Together the 4 piece water filters provide you with 2 years of filtered water. Specifications and Precautions Prewashed and ready to use Vacuum foil packed individually Dimensions: L 12 cm / L 4.7'' If you swallow particles of the charcoal it will do no harm, it is prescribed to treat diarrhoea, digestion and flatulence