Biological Control For Birdbaths, concentrated liquid, one .05 oz. bottle treats 3 average birdbaths for up to 2 years! Microbe-Lift/BMC kills developing mosquitoes before they become breeding, biting adults, including those which may transmit WEST NILE VIRUS and EQUINE ENCEPHALITIS and HEARTWORM DISEASE to dogs and cats. Can be applied to areas that contain aquatic life, fish and plants. Can be applied to areas used by or in contact with humans, animals, horses, livestock, pets, BIRDS or wildlife. Bottle has Convenient dropper control tip.