MatrixCarbon 250 ml — Macroporous Spherical Activated Carbon | Seachem

Seachem MatrixCarbon 250 ml is a unique activated carbon formed into spherical beads made from macroporous bituminous carbon. The only spherical carbon on the market, it does not compact and allows for maximum water flow with optimal contact across its high density of macroporous binding sites. MatrixCarbon outperforms other premium carbons by at least two times in total organic matter removal capacity, adsorption rate, and service life. The 250 ml format treats up to 400 L (100 US gallons) for several months.

Main advantages

• The only spherical activated carbon on the market — does not compact, maximum water flow
• Macroporous bituminous coal — targets large organic molecules (nitrogenous waste), ideal for aquatic filtration
• Surpasses competing carbons by at least 2x in capacity, adsorption rate and duration
• Lowest leachable phosphate content of all major brands of coal tested
• Very low ash content — does not raise the pH above 7.0 even in distilled water

Use in reef and marine aquariums

Activated carbon acts as both a chemical and mechanical filter at the molecular level. Macroporous carbons like MatrixCarbon primarily remove large organic molecules (nitrogenous waste, yellowing compounds), while microporous carbons (coconut) target metals and small ions. The spherical shape of MatrixCarbon solves the compaction and channeling problems of granular carbons—water flows uniformly through all the beads, utilizing all available adsorption sites before they are exhausted. Typical lifespan is 3 to 6 months, depending on the initial water conditions.

Instructions for use

• 250 ml treats up to 400 L (100 US gallons) for several months
• Rinse before use. Place in a filter bag.
• Position to maximize water flow — cartridge filter, chemical filtration module, box filter, or high-flow zone of a filter
• Typical duration: 3 to 6 months depending on the organic load. In very dirty water, it may last only a few hours; in very clean water, several months.

Macroporous vs. microporous

Carbons made from coconut shells form microporous carbons that primarily remove metals and trace elements—better suited for air filtration. Carbons made from bituminous coal, such as MatrixCarbon, form macroporous carbons that remove large organic molecules—better suited for aquarium water filtration.

Phosphate and activated charcoal

All activated carbons contain phosphate from the ash of the source material. MatrixCarbon has the lowest detectable leachable phosphate content of all major brands tested. Its spherical hydrodynamic properties allow for more efficient acid washing, removing more ash than any other activated carbon.

Manufacturer's precautions

• MatrixCarbon will have a minimal impact on trace elements but remains an aggressive medium — for more targeted selectivity, consider Seachem Purigen
• Can be used to remove Seachem Cupramine after treatment

Available formats

• 100 ml
• 250 ml
• 500 ml
• 1 L
• 4 L

Why choose MatrixCarbon at ReefSolution?

MatrixCarbon 250 ml is the ideal starter pack for medium-sized reef aquariums. For even more selective and regenerable organic filtration, combine it with Seachem Purigen—using it together extends the life of Purigen. Place MatrixCarbon in the Seachem The Bag for optimal use.

Frequently Asked Questions

What is the difference between MatrixCarbon and Purigen?

MatrixCarbon is a macroporous activated carbon that removes a wide range of organic compounds and dyes. Purigen is a selective synthetic resin that specifically targets nitrogenous organics, with minimal impact on trace elements. The two are compatible and complementary—the carbon extends the lifespan of Purigen.

Does MatrixCarbon add phosphate to the aquarium?

All charcoals contain phosphate from the ash. MatrixCarbon has the lowest leachable phosphate content of all the major brands tested, thanks to its more efficient acid washing made possible by its spherical shape.

How long does MatrixCarbon last?

Typically 3 to 6 months. In water with a high organic content, it can be depleted in a few hours. In clean water, it can last several months. Its spherical shape ensures that all adsorption sites are used before depletion.