BioAdvanced Mosquito Killer Fizz Tabs are the long-lasting preventative solution you need in the fight against mosquitoes. These unique tabs control mosquito larvae for up to 60 days - even as standing water dries up and returns. Simply drop a Mosquito Killer Fizz Tab in all standing water around your home to keep mosquitoes from breeding. Tabs are safe for use around fish and plants. Use in bird baths, ornamental fish ponds, garden ponds, ornamental fountains, flower pots or planters, rain barrels, buckets, wheelbarrows, garbage cans, floor drains, pot holes, tire tracks, and more. For outdoor use only. One 6-pack provides protection for up to 1 year. Active ingredient: Spinosad.