We have two different size packs of our "Liquid Carbon", one for 5L and one for 25L. Liquid Carbon is a fine carbon powder immersed in water so already pre-activated and dust free when you add it. Unlike granular carbon, you don't send the liquid through the carbon, but rather the carbon through the liquid when you use powders (Liquid Carbon). So the Liquid Carbon is added to water or alcohol, leave it there for 24 hours to absorb most impurities, then filter it off, or use a fining agent like Alcotec 24 Hour Turbo Klar to clear off most of it.
The filtration / clearing is a very important step if you intend to distill the alcohol (where legal) as if you left the carbon with the impurities trapped and then heat it up, you will actually release most of it again!