What is Log10 Reduction? - Understanding Microbe Reduction for Disinfection & Sanitation

Excerpts from the infographic, source linked below:

• "Log” stands for logarithm, which is the exponent of 10.  For example, Log-2 represents 10^2 or 10 x 10 or 100.
• Log Reduction stands for a 10-fold (one decimal) or 90% reduction in numbers of live bacteria.
• Another way to look at it is: 1-Log Reduction would reduce the number of bacteria 90%. This means, for example, that 100 bacteria would be reduced to 10, or 10 reduced to 1. "
• "A 3-Log Reduction on a surface with 1,000,000 microbes would leave 1,000 microbes, which equates to a 99.9% reduction in potentially harmful microorganisms"

Source: https://textiles.milliken.com/docs/default-source/default-document-library/biosmart-document--hfi-log-reduction-chart.pdf