Etymotic The BEAN® Quiet Sound Amplifier® - Manual (Page 13)

CHANGING FILTERS
Each QSA has a special filter that enhances sound quality and prevents
earwax from entering the device. A filter should be changed if the volume
decreases or sound quality declines.
12
Filter Removal
Note: Use the tool to remove the filter.
1. Remove eartip. 2. Insert tool into
the filter.
3. Remove filter.
2. Press gently
against a hard
surface to secure
it in place.
3. Re-attach eartip. 1. Insert a new filter.
Filter Replacement
Note: Do not use the tool to replace the filter.