"We had a bunch of fleas move in after some bad flooding. Nothing I have tried was working. I put the Zodiac powder down and used a broom to work it into the carpet. (Use a dust mask & have all pets/kids out of the house!) After letting it sit for 22 hours, I vac. the house. Every time before I would find dozens of fleas crawling around in the vac canister. Today, I only found one live one, and lots of dead ones! Other than the mess of working it into the carpet, this is a great product!"