In order for phages to be used as agents of environmental control of pathogens, it is necessary to understand how they may interact with other chemical disinfectants that may be used. In this study, biofilms of Pseudomonas aeruginosa were treated with combinations of a phage (P1 or JG4) and disinfectant (sodium hypochlorite) under wet conditions. Overall, it was found that phages were able to disrupt the biofilm and lead to additive synergistic effects when followed by chemical disinfection.