These guys really work ! I am an avid gardener. The area I live in is very damp and humid for a good part of the year. We have a LOT of mosquitos which at times makes any ventur outside unbearable. We also have pets. Mosquitos carry heart worms, so you don't want to expose bow wow to them either. Harsh chemicals will control Mosquitos, but they are dangerous to pets and disrupt your yards ecology. These dunks are a natural alternative that should be a first choice. Use them in any thing that could hold standing water. I break them up and spread them randomly in my flower beds. They are nontoxic to pets and amphibians, but boy do they do the trick on 'skeeters!