MatrixCarbon™ is a truly unique activated carbon. It is formed into a spherical bead for optimal hydrodynamics and will not clump. It allows for maximum water flow and contact thanks to its high density of macroporous binding sites. MatrixCarbon™ has a very low ash content, as indicated by its minimal impact on pH. Even when added to distilled water, it does not raise the pH above 7.0. Although all carbons contain phosphate, regardless of false claims to the contrary, MatrixCarbon™ has the lowest detectable leachable phosphate content of all major carbon brands tested. MatrixCarbon™ outperforms other high-quality carbons by at least twofold in total aquarium organic matter removal capacity, adsorption rate, and service life.

While carbon is generally considered a chemical filter, this isn't entirely accurate. It is, in fact, also a mechanical filter, but it can only mechanically filter out objects of molecular size. It works by filtering through extremely small cracks and crevices called macropores and micropores. Microporous carbons primarily remove metals and smaller ions (such as trace elements) and are best suited for air filtration, while macroporous carbons primarily remove larger organic molecules (such as nitrogenous waste) and are best suited for water filtration.

The ingredients from which a carbon filter is made determine whether it will be macroporous or microporous. Carbon filters made from coconut and other organic products are microporous, while those made from bituminous coal are macroporous. MatrixCarbon™ is a macroporous carbon filter made from bituminous coal. It is the only spherical carbon filter on the market, allowing for maximum water flow. It is sized to allow complete water penetration but not small enough to escape from filter bags. All carbon filters contain phosphate. However, this phosphate does NOT come from washing the carbon with phosphoric acid. Most carbon filters are washed with sulfuric acid. The phosphate is contained in the ash of the carbon source. The primary purpose of acid washing is to remove the ash. Due to the hydrodynamic properties of MatrixCarbon™, more ash is washed from our carbon than any other. Consequently, it has the lowest leachable phosphate on the market.