MatrixCarbon 500 ml — Macroporous Spherical Activated Carbon | Seachem

Seachem MatrixCarbon 500 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 bonding sites. MatrixCarbon outperforms competing premium carbons by at least two times in total organic matter removal capacity, adsorption rate, and service life. The 500 ml format treats up to 800 L (200 US gallons) for several months, making it ideal for medium to large reef aquariums.

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
• Economical 500 ml format — treats up to 800 L (200 US gallons)

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 adsorption sites before exhaustion. Typical lifespan is 3 to 6 months, depending on the initial water conditions.

Instructions for use

• 250 ml treats 400 L (100 US gallons) for several months — the 500 ml size treats up to 800 L
• 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

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 target 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?

The 500ml format is the versatile choice for medium to large 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

Why is the spherical shape of MatrixCarbon important?

Granular carbons compact within the filter, creating dead zones where water doesn't circulate. The spherical shape of MatrixCarbon ensures a uniform water flow and maximum contact with all adsorption sites, eliminating compaction and channeling. As a result, all sites are utilized before exhaustion.

Is MatrixCarbon compatible with Purigen?

Yes. The two are complementary. MatrixCarbon removes a wide range of organic compounds and dyes, while Purigen selectively targets nitrogenous organics. Using carbon with Purigen extends the Purigen's service life.

How long does MatrixCarbon 500 ml last?

Typically, it lasts 3 to 6 months for an aquarium of 800 L or less. In water with a high organic content, it may deplete more quickly. In clean, well-maintained water, it can last several months before needing replacement.