Biocides have been developed to destroy organisms that disturb us in our lives: Mould in the fridge or on walls, algae on façades or even yeasts in paint buckets. Some do not only look shabby, but are also hazardous to health. In addition, the properties of the "host" can also suffer over time. In traditional timber construction, it is a catastrophe when wood rots, because the ceiling, the roof truss or even the entire building can collapse. But since biocides destroy life, it cannot be ruled out that they can also have a negative effect on humans or animals, plants ...