The first decision for using carbon is to treat a liquid or vapor stream. Air is best treated using large particles of carbon to reduce the pressure drop through the bed. Smaller particles are used with liquid applications to reduce the distance the chemicals have to travel to be adsorbed inside the carbon. Whether your project treats vapor or liquid, there are different sized carbon particles available. There are all different substrates such as coal or coconut shell base carbon to consider. Talk to a General Carbon representative to get the best product for your job.