Chemical Filtration removes dissolved compounds and elements from solution in the aquarium systems water. Aquatic Enterprises incorporates three types of chemical filtration depending on the type of aquarium system. Activated carbon: This removes dissolved solids by trapping them in the pores of the carbon. The carbon adsorbs organic and inorganic substances from the water and has a limited amount of adsorption capacity. The carbon therefore needs to be replaced frequently to ensure clear and odorless water. Oxidation: Oxidation of dissolved organics requires the use of an ozone generator. The ozone generator, when installed correctly, will oxidize dissolved organics and kill bacteria and pathogens. Foam Fractionation (protein skimming): This method of filtration also requires the use of specialized equipment. A foam frationator removes compounds in the water by attracting these compounds to the surface of bubbles which are passing though the fractionator. This removes waste and decreases the demand on the other filters, primarily the biological filter.