This mosquito dunk is a natural organic ingredient that kills mosquito larvae that feeds on it. Contains no poisons. Will continue to kill for 30 days. Completely biodegradable. Place 1 dunk wherever water collects: flower pots, overgrown ponds, gutters, bird baths. Will not harm fish or other animals. Each dunk covers 100 sq. ft. Of water surface regardless of depth. 6 pack Kills larvae A natural organic ingredient kills mosquito larvae that feeds on it contains no poisons Will continue to kill for 30 days Completely biodegradable, place 1 dunk wherever water collects: flower pots, overgrown ponds, gutters, bird baths Will not harm fish or other animals Each dunk covers 100 sq. ft. of water surface regardless of depth All natural mosquito control. simply place mosquito dunk in any water garden or any standing water. Carded. Directions for use: Mosquito Dunks: are formulated to release effective levels of Bti for a period of 30 days or more under typical environmental conditions. The floating action of the dunks will ensure that active material is released at the surface as well as gradually settle to the bottom These dunks may be used in all types of containerized mosquito breeding areas. To prevent dunks from being flushed out of certain treatment sites, they can be anchored using a string tied through the hole in the center or staked in place Mosquito Dunks: can also be applied to dry areas which are known or suspected to become breeding sites when flooded, such as abandoned swimming pools, the dunks will float to the surface when flooding occurs and start releasing the active Bti material. Alternate wetting and drying will not reduce their effectiveness Indoor Use: For use in areas that collect water from time to time, areas such as elevator shafts, basements that flood, sump pumps and any drainage areas within buildings. Use the correct amount in accordance with the above dosage table.