Microbe-Lift BMC (Biological Mosquito Control) fully treats any area with standing water that serves as a breeding ground for mosquitos. It consists of natural bacteria that are toxic to mosquito larva, killing mosquito populations at their source. Because these bacteria are only toxic to the target pest, they pose no danger to fish, pets, humans, or vegetation. It fully penetrates the entire depth of the water treated, and it has no negative effects on the aesthetics of the areas in which it's used. 1 tsp treats 540 sq ft of water.