Principles of Effective Disinfection should be paid to the properties and concentration of the disinfectant to be used. Evaluating a Disinfectant by bacterial survival in the manufactures's recommended dilution of a disinfectant. Tyes of Disinfectants are phenol and phenolics, bisphenols, biguanides, halogens, alcohols, heavy metals and their compounds, suface-active agents, chemical food preservatives, antibiotics, aldehydes, chemical sterlization, plasmas, supercritical fluids, and peroxygens and other forms of oxygen.