Originally Posted by suv Uling kasi diba tinatapon din at ang dumi pag kumalat.... Yung activated zeolitewala daw expiration... huhugasan lang daw tapos papaarawan. Pwede na gamitin ulit... put the uling in a container, cover it with a plastic cover with holes so hindi sya kakalat and tatapon. not sue with zeolite works, but if you wash it, somehow, the absorbency will be diminished.