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This article explains why microbial inactivation should be measured using **log reduction** instead of only percentage values such as 99.9%, 99.99%, and 99.999%. It highlights the difference between 3-log, 4-log, and 5-log reduction levels, showing that higher log reduction means far fewer surviving microorganisms and a much higher safety standard. The article also emphasizes that **5-log reduction (99.999%)** is especially important for high-risk applications such as drinking water, healthcare, and laboratory use, and that stable 4–5 log performance is a key benchmark for UVC LED water disinfection systems.

In liquid storage systems, contamination risk does not stop at the moment of filling; it continues throughout the entire storage period. UV disinfection for storage tanks helps maintain clean, safe water and process liquids by suppressing microorganisms that would otherwise grow on tank walls, in dead zones, and along the liquid surface.

Filtration captures pollutants, while UVC actively inactivates microorganisms. Only by combining both can a truly safe and comprehensive indoor air protection system be achieved.