A time release biocide dispensing device for controllably dispensing biocide into a condensation line of an air conditioner at predetermined concentrations and volumes over a duration. The device utilizes principles of pressure equilibrium and material resistance to dispense a regulated and steady flow of the biocide into the line. The device utilizes a controller, a pump, a container, a fluid tube, and a coupling member. The device is configured to easily attach to the line and facilitate setting of the controller, such that minimal tools and expertise are needed for operation. A container attaches to the line and holds a biocide and a volume having a vacuum. A pump forces a fluid into the vacuum to disturb the equilibrium, and thus partially force the biocide into the line. A resistance member restricts the flow to drops to further regulate the flow of the biocide into the line.