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The active ingredient in Mosquito Dunks® is Bacillus thuringiensis subspecies israelensis (BTI). BTI is a bacterium that is deadly to mosquito larvae but harmless to other living things. Mosquito Dunks® float on water and slowly release a long-term biological mosquito larvicide. This larvicide gradually settles in the water and it is eaten by mosquito larvae growing there. Continuous ingestion of the active ingredient produces a chronic infection that kills the larvae. It will keep on working and suppress larval development for 30 days or longer under typical environmental conditions (Effective up to seven weeks – tested by the National Environment Agency, featured in The Straits Times and LianHe ZaoBao on 4 July ’03). Mosquito Dunks® have a central hole, which can be anchored to prevent from being flushed away. Mosquito Dunks® remain effective even after multiple wetting and drying.
Featured in National Environment Agency’s (NEA) “Do the 5-step Mozzie Wipeout”.