I did student teaching in High School and the teacher who I was under used these in her classroom, for a brief period of time anyway. It would not last more than a few days in the classroom setting. Her and I quickly realized this product was pretty useless. The Bright-Air Odor Eliminator Mandarin Orange and Fresh Lemon smells pretty good. It comes in a tub type container. At first it smells really good and fills the room fairly quickly. It's not so overpowering that it will bother someone who has allergies of any sort, which is why we used it in the classroom setting. It didn't bother any of the kids. After about 3 days we noticed no more scent unless we were right beside the container. After a week there was no more scent at all. We decided it was enough of that product and threw it away and replaced it with a much more effective one. Don't waste your money on this. It would probably be okay for very small areas but in a classroom it's definitely useless. There are much better products out there that cost the same or even less money. Use those ones instead! Performance Lasts a VERY short amount of time.