필터가 · 필터를
filter (photo, app); filter (water, air)
Example
이 필터를 쓰면 피부가 더 좋아 보여요.
If you use this filter, your skin looks better.
Word parts
From English 'filter'.
Good to know
Korean camera apps are known for beauty filters. #노필터 'no filter' tags an unedited photo.