Mosquito Briquets/Dunks float on water and will keep on working for 30 days or
longer under typical environmental conditions.
While floating, they slowly release a long-term, biological mosquito larvicide at the waters surface.
This larvicide gradually settles in the water where it is eaten by mosquito larvae growing there. Mosquito Dunks may be used in all
standing water sites where mosquito larvae grow. Alternate wetting and drying will not reduce their effectiveness.