This was my experience with precor 2625. I did 2 applications and still had fleas. I was a pest control tech for 5 yrs. so I understand you have to vacuum first, apply and let dry, vacuum again at least the next day and everyday for the first week. After the second treatment I still had fleas. Also you should know that you can't hold the can straight up and down even though it says you can. The chemical will spew out and waste so hold it more horizontally. I should have gotten better results after 2 treatments. I bought some Wondercide and noticed the improvement after one hour.