April 14, 2021 1 min read

Log Kill or Log Reduction is a mathematical term used to show the relative number of live microbes (bacterium that causes disease or fermentation) eliminated from a surface by disinfecting or cleaning. 

Log Reduction is used in the testing and certification of cleaning and sanitising products to EN Standards.

A summary of log reduction values using a starting point of 1,000,000 is shown below for reference:

Log Kill Reductions

 Log Reduction No. Percentage Reduction Material Left
0 0% 1,000,0000
1 90% 100,000
2 99% 10,000
3 99.9% 1,000
4 99.99% 100
5 99.999% 10
6 99.9999% 1
7 99.99999%

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References

Log Reductions - Wikipedia


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