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Seachem Matrix Carbon Filter Media

Seachem Matrix Carbon Filter Media

Best price now

$13.38at Premium AquaticsObserved at 1:16 AM

25% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.

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Our take on the Seachem Matrix Carbon Filter Media

Seachem MatrixCarbon is a bituminous coal-based activated carbon formed into spherical beads for aquarium filtration. The round shape keeps it from packing, so water flows through it and contacts its macroporous binding sites instead of channeling around a clumped mass. Seachem rates it at under 7.2 pH in distilled water and reports the lowest leachable phosphate of the major carbon brands it tested. The 250 mL bag is the entry size; at $13.38 at Premium Aquatics as of November 4, 2026, it is the lowest new price among the four stores listing it.

Best forFreshwater and saltwater hobbyists running a canister or media reactorReef keepers who want low phosphate leachingTanks where a packed carbon bag has caused channelingBuyers who want a small 250 mL trial size
Pros
  • Spherical beads resist packing and keep flow even
  • Very low ash and phosphate leaching, per Seachem's testing
  • Minimal pH effect, even in distilled water
  • Works in freshwater and saltwater
  • Small 250 mL bag suits nano tanks and reactors
Cons
  • 250 mL treats only about 40 US gallons
  • Carbon exhausts after a few months and needs replacing
  • Spherical beads can escape media bags with coarse mesh
  • No published independent test of the two-fold capacity claim

Seachem Matrix Carbon Filter Media prices at every store

  • DynamicTankNew

    In stock

    $14.98Free shippingObserved at 1:15 AM
    Visit store
  • eBayNew

    In stockSold by gingerbread_pet_supplies

    $20.60+ $5.99 shippingObserved at 1:15 AM
    Visit store
  • Premium AquaticsNew

    Availability unknown

    $13.38Observed at 1:16 AM
    Visit store
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $17.89Observed at 1:15 AM
    Visit store

Also available at

  • Top Shelf AquaticsCheck price at Top Shelf Aquatics
  • WalmartCheck price at Walmart

Seachem Matrix Carbon Filter Media price history

Lowest price we've seen: $13.38 on Nov 4 at Premium Aquatics. Tracked across 6 stores since Nov 4.

What reviewers say

Hobbyists generally rate MatrixCarbon well for its low phosphate and its resistance to packing in reactors. Complaints center on price per volume and on beads working through coarse media bags.

Pros
  • Low phosphate leaching in reef tanks
  • Beads stay loose in media reactors
  • Little effect on pH
Cons
  • Costs more per liter than bulk carbon
  • Beads can slip through coarse mesh bags
  • Needs replacing every few months

From Premium Aquatics

  • Spherical bead activated carbon designed for optimum hydrodynamics; will not pack
  • Permits maximum water flow and contact with high density of macroporous binding sites
  • Very low ash content; does not raise pH above 7.0 even in distilled water
  • Lowest detectable leachable phosphate content of all major carbon brands tested
  • Outperforms other high grade carbons by at least two-fold for total capacity, adsorption rate and duration
  • Bituminous coal-based macroporous carbon; the only spherical carbon on the market
Sizes
100 mL, 250 mL, 500 mL, 1 L, 2 L, 4 L, 20 L, 100 L
Sizing
250 mL will easily treat 400 L (100 gallons) for several months

About the Seachem Matrix Carbon Filter Media

MatrixCarbon" is a truly unique activated carbon. It is formed as a spherical bead for optimum hydrodynamics, and will not pack. It permits maximum water flow and contact with 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 pH above 7.0. While 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 grade carbons by at least two-fold when compared for total capacity to remove aquarium organic matter, rate of adsorption, and duration of use. Sizes: 100 mL 250 mL, 500 mL, 1 L, 2 L, 4 L, 20 L, 100 L Why It's Different Shape ---Spherical Mean Diameter ---2.39 mm Density ---0.49 g/cc Pore Volume (PV)--- 0.55-0.65 mL/cc Total Surface Area (TSA) ---500-600 m2/cc TSA/PV ---770-1100 m2/mL Iodine # --->1000 Molasses # --->600 pH in distilled water ---<7.2 Leachable Phosphate--- <0.00001 g/cc While carbon is generally considered to be a chemical filter, that is not precisely true. It is in fact a mechanical filter as well, but it is only capable of mechanically filtering objects of molecular size. It functions through extremely small cracks and crevices, called macropores and micropores. Microporous carbons remove primarily metals and smaller ions (like trace minerals) and are best suited to air filtration, while macroporous carbons remove primarily larger organic molecules (like nitrogenous waste) and are best suited to water filtration. The ingredients from which a carbon is manufactured determine whether it will be macro- or microporous. Carbons made from coconut shell and other organic products form microporous carbons, while carbons made from bituminous coal form macroporous carbons. MatrixCarbon" is a bituminous coal-based, macroporous carbon. It is the only spherical carbon on the market, allowing for maximum water flow. It is sized to allow full penetration by water, but not small enough to escape filter bags. All carbons contain phosphate. However, that phosphate DOES NOT come from washing the carbon with phosphoric acid. Most carbons are washed with sulfuric acid. The phosphate is contained in the ash from the carbon source. The main purpose of acid-washing is to remove ash. Because of MatrixCarbon's" hydrodynamic properties, more ash is washed from our carbon than any other. Therefore, it has the lowest leachable phosphate on the market. Directions 250 mL will easily treat 400 L (100 gallons*) for several months. MatrixCarbon" is very clean and nearly dust free. For best results, MatrixCarbon" should be placed so as to maximize the flow of water through it. It may be used in a canister filter, chemical filtration module, box filter, or any high flow area of a trickle filter.

Specifications

Primary Application
Aquarium use
Physical Form
Spherical bead
Recommended Dosage
250 mL will easily treat 400 L (100 US gallons)
Dosage Frequency
Several months (duration of effectiveness)
Treatment Type
Water Quality
Product Type
Water Conditioner, Filter Media, Activated carbon
Water Dechlorinator Type

Questions and answers

How much water does the 250 mL bag treat?
Seachem rates 250 mL for about 400 L (100 US gallons). The 100 mL size covers roughly 40 US gallons.
How often should I replace it?
Seachem says it stays effective for several months. Most hobbyists swap carbon every 4 to 8 weeks in heavily stocked tanks.
Does it raise pH?
Seachem states it does not raise distilled water above 7.2 pH. Ash content is low, so the pH shift in a tank is minimal.
Is it safe for saltwater and reef tanks?
Yes. It is sold for both freshwater and saltwater, and its low leachable phosphate is the main reason reef keepers choose it.
What's in the bag?
The package is a bag of spherical activated carbon beads. It is media only; no filter bag or reactor is included.
When is it cheapest?
The 250 mL bag was $13.38 at Premium Aquatics as of November 4, 2026. Larger sizes cost more upfront but less per liter.
Where is the Seachem Matrix Carbon Filter Media cheapest?
At Premium Aquatics, for $13.38, 25% under what the other stores charge, as of our latest check.
Where can I buy the Seachem Matrix Carbon Filter Media?
6 stores we checked sell it, including Premium Aquatics, DynamicTank, eBay, Amazon, Top Shelf Aquatics.

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Carbon-based
Water Treatment Type
Conditioner
Subtype
Activated carbon
Water Volume Treated
Up to 40 U.S Gallons / 160 L
Intended Use
Filtration
Capacity
100 mL
Treatment Volume
Up to 40 U.S Gallons / 160 L
Container Type
Bag
Size
250 ml
Animal Type
Fish
Water Environment
Freshwater
Target Issue
Aquarium organic matter
Age Range
Adult
Typical Users
Aquarium hobbyists
Suitable Water Types
Saltwater, Freshwater
PH Range
Minimal impact on pH, Very little impact to pH
Specific Water Chemistry
Minimal impact on pH