The Case Pack of 12 Summit Mosquito Dunks (containing 6 dunks per pack) is the gold standard for ongoing biological larval control. This bulk configuration is designed for homeowners who want to maintain a consistent treatment schedule throughout the entire mosquito season. The 10.31% Bti concentration is the industry-standard ceiling for consumer-grade larvicides, providing a stable and reliable performance in stagnant water.
Mechanical Design & Durability
The dunks feature a high-density porous substrate engineered to float right at the surface tension line. This is a critical design feature because common mosquito larvae are surface breathers, placing the biological agent exactly where they will ingest it. A practical reality of the Case Pack configuration is that the dunks can be prone to cracking if the outer shipping box is handled roughly, though the structural integrity generally holds up well once placed in water.
In areas with significant water movement, such as clogged gutters during a storm, "drift-loss" can occur. Securing the dunk with a weighted fishing line or a zip-tie to a stationary object is a practical way to ensure it stays in place. The material density is designed to last through high-heat evaporation cycles, maintaining its effectiveness for a full 30 days.
One single 2-inch dunk is rated to cover up to 100 square feet of surface water, making this case pack sufficient for significant residential coverage.
If you prefer a faster-acting "shock" treatment for active larvae that doesn't require a 30-day float, the 30oz Mosquito Bits are a great alternative.
Explore our complete inventory of seasonal pest management tools in the mosquito larvicide dunks category.
