How do I replace the active carbon filter?

To replace the filter, simply twist the inside of each exhalation valve counter clockwise, while holding onto the valve on the outside of the mask. Remove the valves, replace the filter, and screw the valve back on.

Be careful not to misplace the silicone stopper in the valves. Also remember to screw the valves on tightly, as it easy for small parts to get lost.

Here we change the filter in our masks: