Ok I want to see how well DE really works so I set up this little experiment. I took 4 small containers, some DE, and 4 fleas (provided by my dog) to use in the experiment. I place one flea in a container without DE for the control. I then place a flea in each remaining container with differing amounts of DE in them. One had one small pinch of DE, one had two small pinches of DE, and one had three small pinches of DE. Within moments the fleas began to slow down their activity, let's see what it takes to kill these little devils.