* Lack of availability of the material is clean
* Organic and inorganic substances, the level of being dirty
* What type of microorganisms and that the level of contamination
* The concentration of the substance used and the duration of
* Application of the material structure (Which is made of material, is intricate, lumenDid he?)
* The presence of biofilm on the surface of material
* Operation temperature and pH during
* Chemicals in gas form and amount of moisture during the disinfection process