Hydroponic gardeners are aware that carbon filtering is a good method of filtering that uses a piece of activated carbon to remove impurities from the air and water.  Each piece of carbon is designed to provide a large section of surface area, in order to allow contaminants the largest  possible exposure to the filter media.  Your hydroponic indoor garden’s carbon filter is generally activated with a positive charge and is designed to attract negatively charged air and water impurities. Carbon filtering is used for water as well as air purification.

Since the carbon filters are not effective for removing minerals and dissolved inorganic compounds from water, the indoor hydroponic gardener will find that the use of a carbon filter as an air purification system is indispensible. Carbon filter are relatively inexpensive, easy to use and effective. Carbon filters serve a dual purpose of improving air circulation and keeping the area odor-free.