Mosquito Bits a larvaecide that kills mosquito larvae only. It is deemed organic by the USEPA. Bits are harmless to beneficial insects, pets, birds, fish or wildlife. Kills quickly and lasts for up to 14days.Each Dunk covers 100 square feet of surface area. Perfect for Koi ponds, hydroponic systems, animal water troughs, bird baths, rain barrels. Sprinkle Bits wherever there is standing water or standing water will accumulate. For Fungus Gnats, sprinkle on top of the soil and water as usual.