We are using it for "special cleaning work" at the site after a few days of death such as a solitary death site or an isolated death scene, cleaning for garbage residences etc, deodorant etc etc. From the characteristics of the work, in order not to put out the source of bacteria and smell, in case of entering or leaving a room or a house, you need to change it once. It is durable and easy to use on use and there is no problem. To say difficult, it is something that you want me to do more widely. Also, since the number of sheets used for one operation is large, I would like you to make it a little cheaper. Consider Thank you.