We use active charcoal as a natural water filter to remove contaminants and add good minerals to tap water. The skilled artisan makers follow a traditional Japanese technique to make the charcoal. They only prune and coppice the branches of their fast growing native trees and do not remove the roots. This means the trees can grow back, and be harvested again, in five year rotations. They source the wood local to their kilns and this ensures the forests where the wood grows is protected.