Naturally present in mixers and faucets, biofilm is a collection of microorganisms (bacteria, algae, fungi, etc.) that adhere to each other and to surfaces that are generally in contact with water. It is characterized by the secretion of a protective and adhesive matrix (slime).
99.5% of bacteria found in these installations are trapped in the biofilm, which provides the ideal environment for them to develop - water, temperature and nutrients.
![Biofilm](https://www.aquatools.us/var/site/storage/images/8/7/6/9/3099678-12-eng-US/BandeauBiofilmUK.jpg)
In good conditions the bacteria multiply and form aggregates that can easily become detached and contaminate the water supply.
Biofilm is impossible to eradicate. However, its development must nevertheless be controlled.
![Stages in Biofilm development](https://www.aquatools.us/var/site/storage/images/5/8/6/9/3099685-11-eng-US/BandeauBiofilmEtapesUK.jpg)