Grabo Silver Knight eliminates harmful bacteria without the use of chemicals. The floor has a self-disinfecting surface reached by a unique double-defense-line. 1st line of defense: NanoSilver – bacteria is destroyed without the use of chemicals. The disinfectingproperties of silver have been known for more then 3000 years. The silver destroys or inactivates microbes such as bacteria, fungi and viruses. This effect of silver results from the ongoing slow diffusion of silver ions. 2nd line of defense: NanoTiO2 – helps to decompose germs. Titanium dioxide is a photocatalyst, operating similar to chlorophyllian photosynthesis which helps transforming harmful substances into harmless compounds through a chemical oxidation process without being consumed.