• Open the mask to expose the interior of the filter valve.
• According to the OPEN directions on the valve, turn the valve counter(clockwise), to separate the valve.
• Remove the filter.
• Replace the new filter, reverse the above steps, clockwise rotation of the valve, over.

SKYSPER Amazon's store：
UK: https://www.amazon.co.uk/dp/B07DS8G4L3
DE: https://www.amazon.de/dp/B07DS8G4L3
FR: https://www.amazon.fr/dp/B07DS8G4L3
IT: https://www.amazon.it/dp/B07DS8G4L3
ES: https://www.amazon.es/dp/B07DS8G4L3

Package
Quantity: as pictures 1

We are so sorry that we only can send parcel to America, for logistics reasons.

Our Dust Mask Link: https://www.skysper.com/collections/mask