What factor does NOT affect the effectiveness of a chemical disinfection process?

The effectiveness of a chemical disinfection process is influenced primarily by factors such as contact time, concentration of the solution, and temperature of the solution. Contact time refers to the duration that the disinfectant is in contact with the surface needing disinfection; longer contact times typically lead to better microbial kill rates. The concentration of the solution is crucial, as higher concentrations generally increase the effectiveness of the disinfectant, allowing for a broader range of organisms to be eliminated. Temperature can also affect the activity of a disinfectant; many disinfectants work more effectively at higher temperatures, as increased heat can enhance chemical reactions.

In contrast, the cost of the chemical does not impact the disinfection process itself. While cost may influence the choice of a disinfectant or the frequency of its use, it does not have a direct effect on the efficacy of the disinfection process. Therefore, it is the factor that is unrelated to how effectively a chemical disinfectant works on pathogens or microorganisms.