Chemical media can help control phosphate and nitrate levels without compromising water parameters. It can remove toxins that biological and mechanical media cannot, and it is conveniently available in many forms, including bulk, for additional cost savings. Two of the most commonly used forms of chemical media include activated carbon and resin.
The most commonly used form of chemical filter media is
activated carbon. It helps remove a variety of pollutants including copper, chlorine, medications, and other organic and inorganic compounds, and is especially helpful at removing odors and discoloration, making it a must-have for anyone with a showcase aquarium.
A popular activated carbon for freshwater is
Marineland Diamond Blend which is a mixture of Black Diamond and White Diamond. It effectively eliminates dissolved organic wastes and ammonia, and when used with a
media bag can be placed in any filter.