One thing I know for sure, if your vacuum has a bag in it and you're not emptying it each time, the fleas will escape the bag and be right back in the house. Totally ridding the house of fleas will take some time as they reproduce so quickly. Unless you have something that kills the eggs and larvae as well as the adult fleas, you pretty much have to keep attacking until they go through each cycle. Also, you can't let up for even one day or they can be back in full force.