Mosquito Dunks 102-12 Mosquito Killer， 2 Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Formulated to release effective levels of BTI for a period of 30 days or more</li><li>Active material is released at the surface as well as gradually settling to the bottom</li><li>May be used in all types of containerized mosquito breeding areas</li><li>Can be anchored using a string tied through the hole in the center or staked in place</li><li>Alternate wetting and drying will not reduce their effectiveness</li><li>The only larvicide with Bti effective beyond a mosquito generation</li><li>Safe for use in fish habitats and animal watering troughs</li></ul></div><img src="http://ecx.images-amazon.com/images/I/616OXcZbpbL.jpg" noproxy>