While the general population may use terms like sterilizer, disinfectant and sanitizer interchangeably, they actually have very specific definitions according to the government agency that regulates them, the Environmental Protection Agency (EPA). These definitions include what percentage of pathogens must be killed, in what specific amount of time they must be killed, and what protocols must be tested to achieve registration. All of these parameters are defined by the EPA and are not chosen or designated by the manufacturer.