The Summit Mosquito Dunk 20-count pack is a standard-setting larvicide delivery system for home use. These dunks utilize a biological control mechanism that is specifically calibrated to sit at the air-water interface. This positioning is critical because it places the treatment exactly where mosquito larvae congregate to feed and breathe, ensuring high efficacy in variable water environments.
Build Quality & Anchoring
The dunk is composed of a biodegradable floating substrate that maintains its shape for over 30 days without premature dissolution. This hydrophilic stability is a core feature, preventing the active ingredients from sinking and becoming buried in bottom sediment where they would be less effective. A practical reality of this lightweight design is that the dunks can pool in the corners of large ponds or wash away in heavy rain.
To ensure the dunk stays in the primary feeding zone, community feedback suggests using the center aperture to tether the unit with a weighted nylon string. This mechanical fix is especially helpful for rain barrels that might overflow. While the efficacy is high, there is a 24-to-48-hour lag time as the unit begins to shed its biological load, so it is best used as a proactive maintenance tool.
One dunk is designed to treat up to 100 square feet of stagnant water surface, making this 20-count pack sufficient for a full season of coverage for multiple locations.
For faster-acting results in soil-based environments or for "spot" treatments, the 30oz Mosquito Bits are an excellent companion product.
Find more ways to organize and maintain your outdoor water features in our mosquito larvicide dunks section.
