Abstract: Bacterial contamination of industrial water systems lead to biofouling by biofilms and corrosion from bacterial induced corrosion. This invention provides a method for control of fouling and contamination of industrial water systems caused by bacteria. Prevention or reduction of process interruptions and general contamination, fouling and corrosion is achieved by the destruction of targeted problematic bacteria with naturally occurring, non-engineered bacteriophage virulent for targeted bacteria. The invention also provides for in-situ confirmation of the proper identification of target bacteria and a mobile laboratory adapted to implement the method.