Mosquito Summit Dunks (6 Dunks) The only larvicide with Bti effective beyond a mosquito generation Safe for use in fish habitats and animal watering troughs Effective in controlling 100 square feet of water for at least thirty days Great for use in flower pots, tree holes, bird baths, roof gutters, rain barrels, old tires, unused swimming pools, and animal watering troughs 6 Per card