1. First put the mask into a sealed bag.
2. Then put the silicone tube connected to the ozone generator into the bag and seal it.
3. Turn on the ozone generator and let ozone enter the bag through the silicone tube.
4. After injecting enough ozone, pull out the silicone tube and close the bag.
Contact Person: Miss. Lareina Wang
Tel: 86 13352827882