Wood residues and wood waste exist in many forms and in many qualities. Grubbed trees, residues and untreated wood are 100% natural. Lacquered and glued wood, or impregnated and creosoted wood, has been processed with substances that can be harmful for people and the environment. When we collect wood residues and wood waste, we classify the wood into 3 different categories. For processing wood residues and wood waste into wood shavings, sawdust or wood pellets, we only use wood of the highest category, Class A.