I think many of the other reviewers used the product differently than I did. I used this in a hotel room during travel and it was unbelievably awesome. I started out with one reed and then added another one every day, and when I left 10 days later the diffuser was still working AND there was about half of the oil left in the bottom! I think using it this way was perfect, and OMG my hotel room smelled AMAZING. Highly recommend!!