The primary purpose of CT values in disinfection is to quantify the combined effect of contact time and disinfectant concentration needed to achieve a specific level of microbial inactivation, typically a 99.9% (or 3-log) reduction in the target microorganisms. 'CT' stands for Concentration x Time, representing the product of the disinfectant's concentration and the duration it must remain in contact with the water or other medium being disinfected. Disinfection is the process of reducing the number of pathogenic microorganisms – those capable of causing disease – to a safe level. Microbial inactivation refers to the process of rendering microorganisms unable to reproduce or cause harm.
Chlorine, often in the form of hypochlorite (like bleach), is the most common disinfectant for which CT values are calculated and used....
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