Thanks to unique technology, the VK respirators are self-sterilizing. They are more than practical. You can put them off and on normally, over and over again.
They do not require any maintenance. You only need to follow principles of wearing as described in a manual.
Assuming you use the respirator for 5-6 hours a day, it will last up to one week. In other words, 30 hours cumulatively. It is important that the respirator fits on your face perfectly and is without any sign of wear.