The present invention relates to the use of bacteriophages to treat infectious diseases. The method includes creating keepout regions based on a PCB outline and critical components components placed on the PCB design, calculating support tabs based on the created keepout regions, and then placing the support tabs along the border as calculated. A system for treating feedwater to remove contaminants therefrom is also presented, the system comprising at least one high shear mixing device comprising at least one generator comprising a rotor and a stator separated by a shear gap; and a pump configured for delivering feedwater and treatment gas to the high shear mixing device. The safe signal units communicate with the safe control unit, but not with one another, when the apparatus is in the control mode.