Mosquito pellets kill mosquito larvae in standing water. Larvicide treatment provides up to 30 days of protection and can be used around people and pets in all water-holding receptacles where mosquitoes may breed. Ideal to use in bird baths, fish ponds, animal watering troughs, planters, drains, flower pots, water gardens, and more. Prevents adult mosquitoes that may transmit West Nile, Zika, Dengue, Chikungunya, and other mosquito-born diseases. Active ingredient starts to release immediately into the water. 1 tablespoon treats over 2000 gallons of standing water. Can be used in areas that contain aquatic life, fish, and plants. No floating debris. Includes convenient measuring scoop.