 It'll just sit, and then mosquitoes will start to form. The larvae will pop, and then it'll come into mosquitoes, and it'll just do that constant. So that's where these mosquito dunks come in. The dunks sit in those standing areas that you know are going to be standing areas. Like you have a rain barrel. The whole point is to gather the rain to use. Well, it's going to be sitting there if you're not using it.