NOVELTY - Remediating biofouling, bulk foaming and bio-corrosion in an industrial water system comprises identifying a target bacteria strain in a water system; locating and enriching a phage virulent for the bacteria strain; and subjecting the water system to the phage to effect a reduction of target bacteria.    USE - The method is useful for: remediating biofouling, bulk foaming and bio-corrosion in an industrial water system, which is industrial cooling water, sewage and drinking water, paper making water, swimming pool water, fire extinguisher system water, and all forms of industrial process water in any pipe, tank, open pit, pond or channel (claimed); and controlling fouling and contamination of industrial water systems caused by bacteria. Tests details are described but no results given.    ADVANTAGE - The method prevents or reduces a process interruptions and general contamination. The phage is naturally occurring, non-engineered bacteriophage virulent for targeted bacteria, and easily disposable. The method utilizes specific, cheap, safe to handle, natural, and environmentally benign bacteriophage to control biofouling and corrosion. The method reduces the use of toxic and environmentally unsound biocides.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) remediating bacterial corrosion and fouling in industrial water systems comprising: identifying target bacteria in a water system; culturing at least one dominate target bacteria strain; identifying virulent phage for the target bacteria strain; isolating and enriching phage samples for testing; in-situ testing of the identified virulent phage strains; preparing suitable quantity of identified phage to treat the target water system; and subjecting the target water source of the identified phage to effect a reduction of the bacteria strains; and    (2) a mobile laboratory having means designed for identifying a target bacteria strain in an industrial water system and enriching a phage virulent for the bacteria strain comprising; a source of electric power; an enclosable working space that can be maintained clean and sterile; a side loop or container for culturing bacteria that is also equipped with a transfer means and connection means to connect the loop to a target water source; a centrifuge for enriching the bacteria and/or phage; and testing equipment for identification of bacteria and for phage.