Bonide Mosquito Beater Water Soluble Pouches are the first step to controlling mosquitoes, which breed in standing water. Mosquito Beater WSP targets and eliminates mosquito larvae within 24 hours. Perfect for use in water gardens, flower pots, rain barrels, roof gutters, bird baths, tree holes, unused swimming pools, and livestock watering troughs. Safe for fish and other beneficial aquatic organisms. Active ingredient: Bacillus thuringiensis subsp. israelensis (Bti). One pouch treats up to 50 sq. ft. of water. Always read and follow label directions. 24 .2 oz. water soluble pouches.