Keep mosquitos from breeding in standing water with the Summit Mosquito Dunks Larvae Control Tablets. Simply drop the floating tablet into the water, and as it slowly dissolves, it releases a bacterium that is toxic to all species of mosquito larvaeâ€”and harmless to other living things, making it the perfect solution. This larvicide gradually settles and travels through the water, and as female mosquitos lay their eggs in standing water, the larvae will hatch and begin to eat the bacterium. This kills the larvae before they can grow up and become biting and disease-spreading adults.

Mosquito dunk spreads a bacterium that kills larvae before they grow up to become biting adults.
For use in any standing water including rain barrels, bird baths, koi ponds, tree holes, stock tanks, planter reservoirs and rain gutters.
Deadly to mosquito larvae but harmless to other living things with the active ingredient Bacillus thuringiensis subspecies israelensis (Bti).
Bacillus Thuringiensis Subspecies Israelensis Strain BMP 144 Solids, Spores & Insecticidal Toxins: 10.31%

Safety Data Sheets:

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[instruction]Mosquito Dunks float on water and will keep working for 30 days or longer under typical environmental conditions. While floating, they slowly release a long-term, biological mosquito larvacide at the water's surface. This larvacide gradually settles in the water where is it eaten by mosquito larvae growing there. Mosquito Dunks may be used in all types of containerized standing water sites, except finished human drinking water, where most mosquito larvae grow. To prevent them from being washed away, Mosquito Dunks can be anchored using a string tied through the center hole, or they can be staked in place. Use the following table to determine the quantity to be used. 1-5 square feet, 1/4 dunk. 5-25 square feet, 1/2 dunk. 25-100 square feet, 1 dunk. 100 square feet, 1 dunk.[/instruction]