Absorbent cartridges of Fuller's Earth, Activated Alumina, Molecular Sieve or other specialty media are uniquely suited to neutralize acids and maintain the like-new quality of various synthetic oil based hydraulic fluids. Convenient cartridge design makes element replacement easy, reducing the mess and bother associated with disposal. Our tightly packed cartridges of activated carbon effectively adsorb hydrocarbons from amine solutions and also clarify liquids other than oil.