Step 1: While holding the outside of each valve, unscrew both valves counter clockwise until each of the two pieces separate.
Step 2: Unclip or remove the silicone stopper, and rinse it. Be careful not to lose it.
Step 3: Remove the filter
Step 4: Wash the outer layer of the mask by hand with any form of soap for a maximum of 5 minutes
Step 5: Hang it up to dry
Step 6: Insert your new filter, with the flat edge under the nosepiece, and fit the smaller part of the valve on the inside. Then attach the second piece on the front side of the mask, find the right spot, and twist the inner part of the valve clockwise.
Tips: Tighten the valves enough so that they won’t come loose on their own. Tightening them too much could break them.