Biological Mosquito Control 2 oz for Fountains. Microbe-Lift/BMC kills developing mosquitoes before they become breeding biting adults including those which may transmit West Nile Virus and Equine Encephalitis and those which may transmit Heartworm Disease to dogs and cats. It can be applied to areas that can contain aquatic life fish and plants. It can also be applied to areas used by or in contact with humans animals horses livestock pets birds or wildlife.