title_body: Do reusable hemp filters filter out cafestol?
upvoted_answer: Dried and cured hemp will absorb liquids, so they do filter some oil. The material isn't as porous as paper though, so it won't absorb as much as paper. Consider it in between metal and paper in this regard. Also, the absorption properties of hemp will degrade with saturation. This is true for paper filters too, but since hemp are reusable, remember to wash them with soap that removes oil (like Dawn) regularly. More often when brewing dark roasts and extra often with extra oily dark roasts.