Understanding the log reduction count & why it matters in preventing infections
The efficacy of disinfection is concerned with what percentage of live bacteria, virus or fungi is killed by the product.
The highest percentage used is 99.9999%
In scientific terms, this percentage is written as a 6 log10 reduction, however in medical terms it is known as a log 6 kill rate.
Scientists use a logarithmic scale to calculate the log reduction. Each consecutive log reduction number means that the live bacteria, virus or fungi is reduced by one decimal point, meaning that the disinfectant reduces the live bacteria, virus or fungi by 90 percentage for every count.
This example highlights the reduction in bacteria where the pre-treatment bacterial level is 1000 000 bacteria colony:
A 1 log kill reduces a colony to 100 000 after a 99% reduction
A 2 log kill reduces a colony to 100 00 after a 99% reduction
A 3 log kill reduces a colony to 1000 after a 99.9% reduction
A 4 log kill reduces a colony to 100 after a 99.99% reduction
A 5 log kill reduces a colony to 10 after a 99.999% reduction
A 6 log kill reduces a colony to 1 after a 99.9999% reduction
The higher the log is, the higher the killing percentage is of the live bacteria, virus or fungi.
ADI Disinfectant has a log 6.25
The highest log count in any chlorine based product is 6, with a minimum of 4 hours required to kill any bacteria or virus and the surface needs to be completely drenched in the chlorine based product for that period of time before it is effective.
Furthermore not all bacteria and virus are able to be killed by chlorine.
UNDERSTANDING ORP LEVELS
ADI has an ORP level of 950mV immediately and over 1000mV after 3 hours.
Oxidation Reduction Potential (ORP) is a measurement of disinfectant effectiveness in water. ORP is an electronic measurement, in millivolts (mV) of the ability of a chemical substance to oxidize or reduce another chemical substance.
ORP levels should be above 650mV; anything over 750mV is good; and anything over 800 is excellent.
Both oxidation and reduction are chemical processes involving the transfer of electrons between molecules by either gaining or losing an electron. So ORP measures the potential for such reactions to occur in your water. The higher the potential for oxidation, the more efficient your disinfectant. More efficient the disinfectant is, the safer and cleaner your surface is.
ORP is widely used because it is practical, accurate, and allows one to electronically monitor what is going on in the water. While it does not measure the amount of active ingredients in the water, ORP is a real-time reading of ingredients performance. Most agree that disinfection is what really matters, from a health perspective; amount of the active ingredients contained in a disinfectant is not necessarily as important as its effectiveness.